Use ConcurrentDictionary for the configuration.

framework/src/Volo.Abp.ObjectExtending/Volo/Abp/ObjectExtending/ModuleObjectExtensionManagerExtensions.cs

@@ -1,5 +1,4 @@
-using System.Collections.Generic;
+using JetBrains.Annotations;
-using JetBrains.Annotations;
 using Volo.Abp.ObjectExtending.Modularity;
 
 namespace Volo.Abp.ObjectExtending
@@ -15,7 +14,7 @@ namespace Volo.Abp.ObjectExtending
 
             return objectExtensionManager.Configuration.GetOrAdd(
                 ObjectExtensionManagerConfigurationKey,
-                () => new ModuleExtensionConfigurationDictionary()
+                _ => new ModuleExtensionConfigurationDictionary()
             ) as ModuleExtensionConfigurationDictionary;
         }
     }

framework/src/Volo.Abp.ObjectExtending/Volo/Abp/ObjectExtending/ObjectExtensionManager.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using JetBrains.Annotations;
@@ -11,14 +12,14 @@ namespace Volo.Abp.ObjectExtending
         public static ObjectExtensionManager Instance { get; set; } = new ObjectExtensionManager();
 
         [NotNull]
-        public Dictionary<object, object> Configuration { get; }
+        public ConcurrentDictionary<object, object> Configuration { get; }
 
         protected Dictionary<Type, ObjectExtensionInfo> ObjectsExtensions { get; }
         
         protected internal ObjectExtensionManager()
         {
             ObjectsExtensions = new Dictionary<Type, ObjectExtensionInfo>();
-            Configuration = new Dictionary<object, object>();
+            Configuration = new ConcurrentDictionary<object, object>();
         }
 
         [NotNull]