diff --git a/backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/Builder.cs b/backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/Builder.cs
index a3d9d12be..7022aec95 100644
--- a/backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/Builder.cs
+++ b/backend/src/Squidex.Domain.Apps.Entities/Contents/GraphQL/Types/Builder.cs
@@ -153,7 +153,7 @@ namespace Squidex.Domain.Apps.Entities.Contents.GraphQL.Types
 
         public EnumerationGraphType GetEnumeration<T>(string name, string prefix, IEnumerable<T> values)
         {
-            return enumTypes.GetOrAdd(name, x => new FieldEnumType<T>(name, string prefix, values));
+            return enumTypes.GetOrAdd(name, x => new FieldEnumType<T>(name, prefix, values));
         }
 
         public IEnumerable<KeyValuePair<SchemaInfo, ContentGraphType>> GetAllContentTypes()
diff --git a/backend/src/Squidex.Infrastructure/EventSourcing/EnvelopeExtensions.cs b/backend/src/Squidex.Infrastructure/EventSourcing/EnvelopeExtensions.cs
index 0d83825cc..e6c03509c 100644
--- a/backend/src/Squidex.Infrastructure/EventSourcing/EnvelopeExtensions.cs
+++ b/backend/src/Squidex.Infrastructure/EventSourcing/EnvelopeExtensions.cs
@@ -117,7 +117,7 @@ namespace Squidex.Infrastructure.EventSourcing
 
         public static Guid GetGuid(this EnvelopeHeaders obj, string key)
         {
-            if (obj.TryGetValue(key, out var v) && v is JsonString s && Guid.TryParse(v.ToString(), out var guid))
+            if (obj.TryGetValue(key, out var v) && v is JsonString s && Guid.TryParse(s.ToString(), out var guid))
             {
                 return guid;
             }