diff --git a/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppClientsConverter.cs b/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppClientsConverter.cs
index 16570c87b..11eb45b48 100644
--- a/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppClientsConverter.cs
+++ b/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppClientsConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Collections.Generic;
 using Newtonsoft.Json;
 using Squidex.Infrastructure.Json;
@@ -26,7 +27,7 @@ namespace Squidex.Domain.Apps.Core.Apps.Json
             serializer.Serialize(writer, json);
         }
 
-        protected override AppClients ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override AppClients ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             var json = serializer.Deserialize<Dictionary<string, JsonAppClient>>(reader);
 
diff --git a/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppContributorsConverter.cs b/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppContributorsConverter.cs
index efa326377..5c4921d08 100644
--- a/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppContributorsConverter.cs
+++ b/src/Squidex.Domain.Apps.Core.Model/Apps/Json/AppContributorsConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Collections.Generic;
 using Newtonsoft.Json;
 using Squidex.Infrastructure.Json;
@@ -26,7 +27,7 @@ namespace Squidex.Domain.Apps.Core.Apps.Json
             serializer.Serialize(writer, json);
         }
 
-        protected override AppContributors ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override AppContributors ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             var json = serializer.Deserialize<Dictionary<string, AppContributorPermission>>(reader);
 
diff --git a/src/Squidex.Domain.Apps.Core.Model/Apps/Json/LanguagesConfigConverter.cs b/src/Squidex.Domain.Apps.Core.Model/Apps/Json/LanguagesConfigConverter.cs
index af52f34a9..1ae94f71c 100644
--- a/src/Squidex.Domain.Apps.Core.Model/Apps/Json/LanguagesConfigConverter.cs
+++ b/src/Squidex.Domain.Apps.Core.Model/Apps/Json/LanguagesConfigConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Collections.Generic;
 using Newtonsoft.Json;
 using Squidex.Infrastructure.Json;
@@ -26,7 +27,7 @@ namespace Squidex.Domain.Apps.Core.Apps.Json
             serializer.Serialize(writer, json);
         }
 
-        protected override LanguagesConfig ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override LanguagesConfig ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             var json = serializer.Deserialize<Dictionary<string, JsonLanguageConfig>>(reader);
 
diff --git a/src/Squidex.Domain.Apps.Core.Model/Rules/Json/RuleConverter.cs b/src/Squidex.Domain.Apps.Core.Model/Rules/Json/RuleConverter.cs
index cd3e9707f..176820ef5 100644
--- a/src/Squidex.Domain.Apps.Core.Model/Rules/Json/RuleConverter.cs
+++ b/src/Squidex.Domain.Apps.Core.Model/Rules/Json/RuleConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using Newtonsoft.Json;
 using Squidex.Infrastructure.Json;
 
@@ -13,14 +14,14 @@ namespace Squidex.Domain.Apps.Core.Rules.Json
 {
     public sealed class RuleConverter : JsonClassConverter<Rule>
     {
-        protected override Rule ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override void WriteValue(JsonWriter writer, Rule value, JsonSerializer serializer)
         {
-            return serializer.Deserialize<JsonRule>(reader).ToRule();
+            serializer.Serialize(writer, new JsonRule(value));
         }
 
-        protected override void WriteValue(JsonWriter writer, Rule value, JsonSerializer serializer)
+        protected override Rule ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
-            serializer.Serialize(writer, new JsonRule(value));
+            return serializer.Deserialize<JsonRule>(reader).ToRule();
         }
     }
 }
diff --git a/src/Squidex.Domain.Apps.Core.Model/Schemas/Json/SchemaConverter.cs b/src/Squidex.Domain.Apps.Core.Model/Schemas/Json/SchemaConverter.cs
index 317afa717..6db657dc2 100644
--- a/src/Squidex.Domain.Apps.Core.Model/Schemas/Json/SchemaConverter.cs
+++ b/src/Squidex.Domain.Apps.Core.Model/Schemas/Json/SchemaConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using Newtonsoft.Json;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.Json;
@@ -28,7 +29,7 @@ namespace Squidex.Domain.Apps.Core.Schemas.Json
             serializer.Serialize(writer, new JsonSchemaModel(value));
         }
 
-        protected override Schema ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override Schema ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             return serializer.Deserialize<JsonSchemaModel>(reader).ToSchema(fieldRegistry);
         }
diff --git a/src/Squidex.Infrastructure/CQRS/Events/Envelope{T}.cs b/src/Squidex.Infrastructure/CQRS/Events/Envelope{T}.cs
index c03435422..64e6fa29a 100644
--- a/src/Squidex.Infrastructure/CQRS/Events/Envelope{T}.cs
+++ b/src/Squidex.Infrastructure/CQRS/Events/Envelope{T}.cs
@@ -23,23 +23,12 @@ namespace Squidex.Infrastructure.CQRS.Events
             get { return payload; }
         }
 
-        public Envelope(T payload)
-            : this(payload, new EnvelopeHeaders())
-        {
-        }
-
-        public Envelope(T payload, PropertiesBag bag)
-            : this(payload, new EnvelopeHeaders(bag))
-        {
-        }
-
-        public Envelope(T payload, EnvelopeHeaders headers)
+        public Envelope(T payload, EnvelopeHeaders headers = null)
         {
             Guard.NotNull(payload, nameof(payload));
-            Guard.NotNull(headers, nameof(headers));
 
             this.payload = payload;
-            this.headers = headers;
+            this.headers = headers ?? new EnvelopeHeaders();
         }
 
         public Envelope<TOther> To<TOther>() where TOther : class
diff --git a/src/Squidex.Infrastructure/CQRS/Events/EventDataFormatter.cs b/src/Squidex.Infrastructure/CQRS/Events/EventDataFormatter.cs
index 60d6f7095..939577d31 100644
--- a/src/Squidex.Infrastructure/CQRS/Events/EventDataFormatter.cs
+++ b/src/Squidex.Infrastructure/CQRS/Events/EventDataFormatter.cs
@@ -27,7 +27,7 @@ namespace Squidex.Infrastructure.CQRS.Events
 
         public virtual Envelope<IEvent> Parse(EventData eventData, bool migrate = true)
         {
-            var headers = ReadJson<PropertiesBag>(eventData.Metadata);
+            var headers = ReadJson<EnvelopeHeaders>(eventData.Metadata);
 
             var eventType = typeNameRegistry.GetType(eventData.Type);
             var eventPayload = ReadJson<IEvent>(eventData.Payload, eventType);
diff --git a/src/Squidex.Infrastructure/Json/ClaimsPrincipalConverter.cs b/src/Squidex.Infrastructure/Json/ClaimsPrincipalConverter.cs
index aca3cdf7f..220086706 100644
--- a/src/Squidex.Infrastructure/Json/ClaimsPrincipalConverter.cs
+++ b/src/Squidex.Infrastructure/Json/ClaimsPrincipalConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Linq;
 using System.Security.Claims;
 using Newtonsoft.Json;
@@ -48,7 +49,7 @@ namespace Squidex.Infrastructure.Json
             serializer.Serialize(writer, jsonIdentities);
         }
 
-        protected override ClaimsPrincipal ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override ClaimsPrincipal ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             var jsonIdentities = serializer.Deserialize<JsonIdentity[]>(reader);
 
diff --git a/src/Squidex.Infrastructure/Json/JsonClassConverter.cs b/src/Squidex.Infrastructure/Json/JsonClassConverter.cs
index a784d6397..5053625be 100644
--- a/src/Squidex.Infrastructure/Json/JsonClassConverter.cs
+++ b/src/Squidex.Infrastructure/Json/JsonClassConverter.cs
@@ -20,7 +20,7 @@ namespace Squidex.Infrastructure.Json
                 return null;
             }
 
-            return ReadValue(reader, serializer);
+            return ReadValue(reader, objectType, serializer);
         }
 
         public sealed override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
@@ -41,6 +41,6 @@ namespace Squidex.Infrastructure.Json
 
         protected abstract void WriteValue(JsonWriter writer, T value, JsonSerializer serializer);
 
-        protected abstract T ReadValue(JsonReader reader, JsonSerializer serializer);
+        protected abstract T ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer);
     }
 }
diff --git a/src/Squidex.Infrastructure/Json/LanguageConverter.cs b/src/Squidex.Infrastructure/Json/LanguageConverter.cs
index 25d2fa296..73e9a8c85 100644
--- a/src/Squidex.Infrastructure/Json/LanguageConverter.cs
+++ b/src/Squidex.Infrastructure/Json/LanguageConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using Newtonsoft.Json;
 
 namespace Squidex.Infrastructure.Json
@@ -17,7 +18,7 @@ namespace Squidex.Infrastructure.Json
             writer.WriteValue(value.Iso2Code);
         }
 
-        protected override Language ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override Language ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             if (reader.TokenType != JsonToken.String)
             {
diff --git a/src/Squidex.Infrastructure/Json/NamedGuidIdConverter.cs b/src/Squidex.Infrastructure/Json/NamedGuidIdConverter.cs
index 9e572d2c3..968cb3762 100644
--- a/src/Squidex.Infrastructure/Json/NamedGuidIdConverter.cs
+++ b/src/Squidex.Infrastructure/Json/NamedGuidIdConverter.cs
@@ -19,7 +19,7 @@ namespace Squidex.Infrastructure.Json
             writer.WriteValue($"{value.Id},{value.Name}");
         }
 
-        protected override NamedId<Guid> ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override NamedId<Guid> ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             if (reader.TokenType != JsonToken.String)
             {
diff --git a/src/Squidex.Infrastructure/Json/NamedLongIdConverter.cs b/src/Squidex.Infrastructure/Json/NamedLongIdConverter.cs
index f81b62650..4829f79c4 100644
--- a/src/Squidex.Infrastructure/Json/NamedLongIdConverter.cs
+++ b/src/Squidex.Infrastructure/Json/NamedLongIdConverter.cs
@@ -19,7 +19,7 @@ namespace Squidex.Infrastructure.Json
             writer.WriteValue($"{value.Id},{value.Name}");
         }
 
-        protected override NamedId<long> ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override NamedId<long> ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             if (reader.TokenType != JsonToken.String)
             {
diff --git a/src/Squidex.Infrastructure/Json/NamedStringIdConverter.cs b/src/Squidex.Infrastructure/Json/NamedStringIdConverter.cs
index 4fb5a379e..1b409882f 100644
--- a/src/Squidex.Infrastructure/Json/NamedStringIdConverter.cs
+++ b/src/Squidex.Infrastructure/Json/NamedStringIdConverter.cs
@@ -19,7 +19,7 @@ namespace Squidex.Infrastructure.Json
             writer.WriteValue($"{value.Id},{value.Name}");
         }
 
-        protected override NamedId<string> ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override NamedId<string> ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             if (reader.TokenType != JsonToken.String)
             {
diff --git a/src/Squidex.Infrastructure/Json/Orleans/JsonExternalSerializer.cs b/src/Squidex.Infrastructure/Json/Orleans/JsonExternalSerializer.cs
index e18e41e92..f14070130 100644
--- a/src/Squidex.Infrastructure/Json/Orleans/JsonExternalSerializer.cs
+++ b/src/Squidex.Infrastructure/Json/Orleans/JsonExternalSerializer.cs
@@ -18,13 +18,13 @@ namespace Squidex.Infrastructure.Json.Orleans
 {
     public class JsonExternalSerializer : IExternalSerializer
     {
-        private readonly JsonSerializer jsonSerializer;
+        private readonly JsonSerializer serializer;
 
-        public JsonExternalSerializer(JsonSerializer jsonSerializer)
+        public JsonExternalSerializer(JsonSerializer serializer)
         {
-            Guard.NotNull(jsonSerializer, nameof(jsonSerializer));
+            Guard.NotNull(serializer, nameof(serializer));
 
-            this.jsonSerializer = jsonSerializer;
+            this.serializer = serializer;
         }
 
         public void Initialize(Logger logger)
@@ -38,7 +38,7 @@ namespace Squidex.Infrastructure.Json.Orleans
 
         public object DeepCopy(object source, ICopyContext context)
         {
-            return source != null ? JObject.FromObject(source, jsonSerializer).ToObject(source.GetType(), jsonSerializer) : null;
+            return source != null ? JObject.FromObject(source, serializer).ToObject(source.GetType(), serializer) : null;
         }
 
         public object Deserialize(Type expectedType, IDeserializationContext context)
@@ -50,7 +50,7 @@ namespace Squidex.Infrastructure.Json.Orleans
 
             using (var reader = new JsonTextReader(new StreamReader(stream)))
             {
-                return jsonSerializer.Deserialize(reader, expectedType);
+                return serializer.Deserialize(reader, expectedType);
             }
         }
 
@@ -60,7 +60,7 @@ namespace Squidex.Infrastructure.Json.Orleans
 
             using (var writer = new JsonTextWriter(new StreamWriter(stream)))
             {
-                jsonSerializer.Serialize(writer, item);
+                serializer.Serialize(writer, item);
 
                 writer.Flush();
             }
diff --git a/src/Squidex.Infrastructure/Json/PropertiesBagConverter.cs b/src/Squidex.Infrastructure/Json/PropertiesBagConverter.cs
index fad3d3243..ae6990e9a 100644
--- a/src/Squidex.Infrastructure/Json/PropertiesBagConverter.cs
+++ b/src/Squidex.Infrastructure/Json/PropertiesBagConverter.cs
@@ -13,9 +13,9 @@ using NodaTime.Extensions;
 
 namespace Squidex.Infrastructure.Json
 {
-    public sealed class PropertiesBagConverter : JsonClassConverter<PropertiesBag>
+    public sealed class PropertiesBagConverter<T> : JsonClassConverter<T> where T : PropertiesBag, new()
     {
-        protected override void WriteValue(JsonWriter writer, PropertiesBag value, JsonSerializer serializer)
+        protected override void WriteValue(JsonWriter writer, T value, JsonSerializer serializer)
         {
             writer.WriteStartObject();
 
@@ -36,14 +36,14 @@ namespace Squidex.Infrastructure.Json
             writer.WriteEndObject();
         }
 
-        protected override PropertiesBag ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override T ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             if (reader.TokenType != JsonToken.StartObject)
             {
                 throw new JsonException($"Expected Object, but got {reader.TokenType}.");
             }
 
-            var properties = new PropertiesBag();
+            var properties = new T();
 
             while (reader.Read())
             {
@@ -73,7 +73,7 @@ namespace Squidex.Infrastructure.Json
 
         public override bool CanConvert(Type objectType)
         {
-            return typeof(PropertiesBag).IsAssignableFrom(objectType);
+            return objectType == typeof(T);
         }
     }
 }
diff --git a/src/Squidex.Infrastructure/Json/RefTokenConverter.cs b/src/Squidex.Infrastructure/Json/RefTokenConverter.cs
index 9964c7f3a..92dfa7a4c 100644
--- a/src/Squidex.Infrastructure/Json/RefTokenConverter.cs
+++ b/src/Squidex.Infrastructure/Json/RefTokenConverter.cs
@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using Newtonsoft.Json;
 
 namespace Squidex.Infrastructure.Json
@@ -17,7 +18,7 @@ namespace Squidex.Infrastructure.Json
             writer.WriteValue(value.ToString());
         }
 
-        protected override RefToken ReadValue(JsonReader reader, JsonSerializer serializer)
+        protected override RefToken ReadValue(JsonReader reader, Type objectType, JsonSerializer serializer)
         {
             if (reader.TokenType != JsonToken.String)
             {
diff --git a/src/Squidex.Infrastructure/Reflection/SimpleMapper.cs b/src/Squidex.Infrastructure/Reflection/SimpleMapper.cs
index a38c522c1..dabd13661 100644
--- a/src/Squidex.Infrastructure/Reflection/SimpleMapper.cs
+++ b/src/Squidex.Infrastructure/Reflection/SimpleMapper.cs
@@ -121,7 +121,7 @@ namespace Squidex.Infrastructure.Reflection
                             new PropertyAccessor(sourceClassType, sourceProperty),
                             new PropertyAccessor(targetClassType, targetProperty)));
                     }
-                    else if (targetType.Implements<IConvertible>() && sourceType.Implements<IConvertible>())
+                    else if (targetType.Implements<IConvertible>())
                     {
                         Mappers.Add(new ConversionPropertyMapper(
                             new PropertyAccessor(sourceClassType, sourceProperty),
diff --git a/src/Squidex/Config/Domain/SerializationServices.cs b/src/Squidex/Config/Domain/SerializationServices.cs
index 1e30fa762..75b9ed153 100644
--- a/src/Squidex/Config/Domain/SerializationServices.cs
+++ b/src/Squidex/Config/Domain/SerializationServices.cs
@@ -18,6 +18,7 @@ using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Core.Schemas.Json;
 using Squidex.Domain.Apps.Events;
 using Squidex.Infrastructure;
+using Squidex.Infrastructure.CQRS.Events;
 using Squidex.Infrastructure.Json;
 using Squidex.Infrastructure.MongoDb;
 
@@ -48,7 +49,8 @@ namespace Squidex.Config.Domain
                 new NamedGuidIdConverter(),
                 new NamedLongIdConverter(),
                 new NamedStringIdConverter(),
-                new PropertiesBagConverter(),
+                new PropertiesBagConverter<EnvelopeHeaders>(),
+                new PropertiesBagConverter<PropertiesBag>(),
                 new RefTokenConverter(),
                 new RuleConverter(),
                 new SchemaConverter(FieldRegistry),
diff --git a/tests/Squidex.Infrastructure.Tests/CQRS/Events/EnvelopeTests.cs b/tests/Squidex.Infrastructure.Tests/CQRS/Events/EnvelopeTests.cs
new file mode 100644
index 000000000..bf86bd336
--- /dev/null
+++ b/tests/Squidex.Infrastructure.Tests/CQRS/Events/EnvelopeTests.cs
@@ -0,0 +1,32 @@
+// ==========================================================================
+//  EnvelopeTests.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using Squidex.Infrastructure.Json;
+using Squidex.Infrastructure.TestHelpers;
+using Xunit;
+
+namespace Squidex.Infrastructure.CQRS.Events
+{
+    public class EnvelopeTests
+    {
+        public class MyEvent : IEvent
+        {
+            public int Value { get; set; }
+        }
+
+        [Fact]
+        public void Should_serialize_and_deserialize()
+        {
+            var value = new Envelope<IEvent>(new MyEvent { Value = 1 });
+
+            var deserialized = value.SerializeAndDeserializeAndReturn(new PropertiesBagConverter<EnvelopeHeaders>());
+
+            Assert.Equal(1, value.To<MyEvent>().Payload.Value);
+        }
+    }
+}
diff --git a/tests/Squidex.Infrastructure.Tests/CQRS/Events/EventDataFormatterTests.cs b/tests/Squidex.Infrastructure.Tests/CQRS/Events/EventDataFormatterTests.cs
index 7e07d5dd4..a7dd55470 100644
--- a/tests/Squidex.Infrastructure.Tests/CQRS/Events/EventDataFormatterTests.cs
+++ b/tests/Squidex.Infrastructure.Tests/CQRS/Events/EventDataFormatterTests.cs
@@ -38,7 +38,7 @@ namespace Squidex.Infrastructure.CQRS.Events
 
         public EventDataFormatterTests()
         {
-            serializerSettings.Converters.Add(new PropertiesBagConverter());
+            serializerSettings.Converters.Add(new PropertiesBagConverter<EnvelopeHeaders>());
 
             typeNameRegistry.Map(typeof(MyEvent), "Event");
             typeNameRegistry.Map(typeof(MyOldEvent), "OldEvent");
diff --git a/tests/Squidex.Infrastructure.Tests/CQRS/Events/RetrySubscriptionTests.cs b/tests/Squidex.Infrastructure.Tests/CQRS/Events/RetrySubscriptionTests.cs
index a49a4a723..069cf4d55 100644
--- a/tests/Squidex.Infrastructure.Tests/CQRS/Events/RetrySubscriptionTests.cs
+++ b/tests/Squidex.Infrastructure.Tests/CQRS/Events/RetrySubscriptionTests.cs
@@ -63,17 +63,29 @@ namespace Squidex.Infrastructure.CQRS.Events
             var ex = new InvalidOperationException();
 
             await OnErrorAsync(eventSubscription, ex);
-            await OnErrorAsync(eventSubscription, ex);
-            await OnErrorAsync(eventSubscription, ex);
-            await OnErrorAsync(eventSubscription, ex);
-            await OnErrorAsync(eventSubscription, ex);
-            await OnErrorAsync(eventSubscription, ex);
+            await OnErrorAsync(null, ex);
+            await OnErrorAsync(null, ex);
+            await OnErrorAsync(null, ex);
+            await OnErrorAsync(null, ex);
+            await OnErrorAsync(null, ex);
             await sut.StopAsync();
 
             A.CallTo(() => eventSubscriber.OnErrorAsync(sut, ex))
                 .MustHaveHappened();
         }
 
+        [Fact]
+        public async Task Should_not_forward_error_when_exception_is_from_another_subscription()
+        {
+            var ex = new InvalidOperationException();
+
+            await OnErrorAsync(A.Fake<IEventSubscription>(), ex);
+            await sut.StopAsync();
+
+            A.CallTo(() => eventSubscriber.OnErrorAsync(A<IEventSubscription>.Ignored, A<Exception>.Ignored))
+                .MustNotHaveHappened();
+        }
+
         [Fact]
         public async Task Should_forward_event_from_inner_subscription()
         {
@@ -87,26 +99,34 @@ namespace Squidex.Infrastructure.CQRS.Events
         }
 
         [Fact]
-        public async Task Should_not_forward_error_when_exception_is_from_another_subscription()
+        public async Task Should_not_forward_event_when_message_is_from_another_subscription()
         {
-            var ex = new InvalidOperationException();
+            var ev = new StoredEvent("1", 2, new EventData());
 
-            await OnErrorAsync(A.Fake<IEventSubscription>(), ex);
+            await OnEventAsync(A.Fake<IEventSubscription>(), ev);
             await sut.StopAsync();
 
-            A.CallTo(() => eventSubscriber.OnErrorAsync(A<IEventSubscription>.Ignored, A<Exception>.Ignored))
+            A.CallTo(() => eventSubscriber.OnEventAsync(A<IEventSubscription>.Ignored, A<StoredEvent>.Ignored))
                 .MustNotHaveHappened();
         }
 
         [Fact]
-        public async Task Should_not_forward_event_when_message_is_from_another_subscription()
+        public async Task Should_forward_closed_from_inner_subscription()
         {
-            var ev = new StoredEvent("1", 2, new EventData());
+            await OnClosedAsync(eventSubscription);
+            await sut.StopAsync();
 
-            await OnEventAsync(A.Fake<IEventSubscription>(), ev);
+            A.CallTo(() => eventSubscriber.OnClosedAsync(sut))
+                .MustHaveHappened();
+        }
+
+        [Fact]
+        public async Task Should_not_forward_closed_when_message_is_from_another_subscription()
+        {
+            await OnClosedAsync(A.Fake<IEventSubscription>());
             await sut.StopAsync();
 
-            A.CallTo(() => eventSubscriber.OnEventAsync(A<IEventSubscription>.Ignored, A<StoredEvent>.Ignored))
+            A.CallTo(() => eventSubscriber.OnClosedAsync(sut))
                 .MustNotHaveHappened();
         }
 
@@ -119,5 +139,10 @@ namespace Squidex.Infrastructure.CQRS.Events
         {
             return sutSubscriber.OnEventAsync(subscriber, ev);
         }
+
+        private Task OnClosedAsync(IEventSubscription subscriber)
+        {
+            return sutSubscriber.OnClosedAsync(subscriber);
+        }
     }
 }
\ No newline at end of file
diff --git a/tests/Squidex.Infrastructure.Tests/PropertiesBagTests.cs b/tests/Squidex.Infrastructure.Tests/PropertiesBagTests.cs
index 752036a2e..4ebdd6038 100644
--- a/tests/Squidex.Infrastructure.Tests/PropertiesBagTests.cs
+++ b/tests/Squidex.Infrastructure.Tests/PropertiesBagTests.cs
@@ -10,9 +10,9 @@ using System;
 using System.Globalization;
 using System.Linq;
 using Microsoft.CSharp.RuntimeBinder;
-using Newtonsoft.Json;
 using NodaTime;
 using Squidex.Infrastructure.Json;
+using Squidex.Infrastructure.TestHelpers;
 using Xunit;
 
 namespace Squidex.Infrastructure
@@ -31,12 +31,7 @@ namespace Squidex.Infrastructure
         [Fact]
         public void Should_serialize_and_deserialize_empty_bag()
         {
-            var serializerSettings = new JsonSerializerSettings();
-
-            serializerSettings.Converters.Add(new PropertiesBagConverter());
-
-            var content = JsonConvert.SerializeObject(bag, serializerSettings);
-            var output = JsonConvert.DeserializeObject<PropertiesBag>(content, serializerSettings);
+            var output = bag.SerializeAndDeserializeAndReturn(new PropertiesBagConverter<PropertiesBag>());
 
             Assert.Equal(bag.Count, output.Count);
         }
@@ -52,19 +47,14 @@ namespace Squidex.Infrastructure
             bag.Set("Key4", true);
             bag.Set("Key5", Guid.NewGuid());
 
-            var serializerSettings = new JsonSerializerSettings();
-
-            serializerSettings.Converters.Add(new PropertiesBagConverter());
-
-            var content = JsonConvert.SerializeObject(bag, serializerSettings);
-            var response = JsonConvert.DeserializeObject<PropertiesBag>(content, serializerSettings);
+            var output = bag.SerializeAndDeserializeAndReturn(new PropertiesBagConverter<PropertiesBag>());
 
-            foreach (var kvp in response.Properties.Take(4))
+            foreach (var kvp in output.Properties.Take(4))
             {
                 Assert.Equal(kvp.Value.RawValue, bag[kvp.Key].RawValue);
             }
 
-            Assert.Equal(bag["Key5"].ToGuid(c), response["Key5"].ToGuid(c));
+            Assert.Equal(bag["Key5"].ToGuid(c), output["Key5"].ToGuid(c));
         }
 
         [Fact]
diff --git a/tests/Squidex.Infrastructure.Tests/Reflection/SimpleMapperTests.cs b/tests/Squidex.Infrastructure.Tests/Reflection/SimpleMapperTests.cs
index 47b5e7029..7c6490174 100644
--- a/tests/Squidex.Infrastructure.Tests/Reflection/SimpleMapperTests.cs
+++ b/tests/Squidex.Infrastructure.Tests/Reflection/SimpleMapperTests.cs
@@ -70,7 +70,7 @@ namespace Squidex.Infrastructure.Reflection
         }
 
         [Fact]
-        public void Should_to_type()
+        public void Should_map_to_type()
         {
             var class1 = new MyClass1
             {
diff --git a/tests/Squidex.Infrastructure.Tests/TestHelpers/JsonHelper.cs b/tests/Squidex.Infrastructure.Tests/TestHelpers/JsonHelper.cs
index 394475828..35e3d55da 100644
--- a/tests/Squidex.Infrastructure.Tests/TestHelpers/JsonHelper.cs
+++ b/tests/Squidex.Infrastructure.Tests/TestHelpers/JsonHelper.cs
@@ -38,10 +38,7 @@ namespace Squidex.Infrastructure.TestHelpers
 
         public static T SerializeAndDeserializeAndReturn<T>(this T value, JsonConverter converter)
         {
-            var serializerSettings = new JsonSerializerSettings();
-
-            serializerSettings.Converters.Add(converter);
-            serializerSettings.NullValueHandling = NullValueHandling.Include;
+            var serializerSettings = CreateSettings<T>(converter);
 
             var result = JsonConvert.SerializeObject(Tuple.Create(value), serializerSettings);
             var output = JsonConvert.DeserializeObject<Tuple<T>>(result, serializerSettings);
@@ -50,13 +47,25 @@ namespace Squidex.Infrastructure.TestHelpers
         }
 
         public static void DoesNotDeserialize<T>(string value, JsonConverter converter)
+        {
+            var serializerSettings = CreateSettings<T>(converter);
+
+            Assert.ThrowsAny<JsonException>(() => JsonConvert.DeserializeObject<Tuple<T>>($"{{ \"Item1\": \"{value}\" }}", serializerSettings));
+        }
+
+        private static JsonSerializerSettings CreateSettings<T>(JsonConverter converter)
         {
             var serializerSettings = new JsonSerializerSettings();
 
-            serializerSettings.Converters.Add(converter);
+            if (converter != null)
+            {
+                serializerSettings.Converters.Add(converter);
+            }
+
             serializerSettings.NullValueHandling = NullValueHandling.Include;
+            serializerSettings.TypeNameHandling = TypeNameHandling.Auto;
 
-            Assert.ThrowsAny<JsonException>(() => JsonConvert.DeserializeObject<Tuple<T>>($"{{ \"Item1\": \"{value}\" }}", serializerSettings));
+            return serializerSettings;
         }
     }
 }