Merge pull request #6498 from sesamefly/patch-1

Check `context.Metadata.ContainerType` if is null.

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/ModelBinding/AbpExtraPropertiesDictionaryModelBinderProvider.cs

@@ -23,7 +23,8 @@ namespace Volo.Abp.AspNetCore.Mvc.ModelBinding
                 return null;
             }
 
-            if (!context.Metadata.ContainerType.IsAssignableTo<IHasExtraProperties>())
+            if (context.Metadata.ContainerType == null ||
+                !context.Metadata.ContainerType.IsAssignableTo<IHasExtraProperties>())
             {
                 return null;
             }