Check for null.

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Entities/Events/EntityChangeEventHelper.cs

@@ -65,13 +65,17 @@ namespace Volo.Abp.Domain.Entities.Events
                 false
             );
 
+            var eto = EntityToEtoMapper.Map(entity);
+            if (eto != null)
+            {
                 await TriggerEventWithEntity(
                     DistributedEventBus,
                     typeof(EntityCreatedEto<>),
-                EntityToEtoMapper.Map(entity),
+                    eto,
                     false
                 );
             }
+        }
 
         public virtual async Task TriggerEntityUpdatingEventAsync(object entity)
         {
@@ -92,13 +96,17 @@ namespace Volo.Abp.Domain.Entities.Events
                 false
             );
 
+            var eto = EntityToEtoMapper.Map(entity);
+            if (eto != null)
+            {
                 await TriggerEventWithEntity(
                     DistributedEventBus,
                     typeof(EntityUpdatedEto<>),
-                EntityToEtoMapper.Map(entity),
+                    eto,
                     false
                 );
             }
+        }
 
         public virtual async Task TriggerEntityDeletingEventAsync(object entity)
         {
@@ -119,6 +127,9 @@ namespace Volo.Abp.Domain.Entities.Events
                 false
             );
 
+            var eto = EntityToEtoMapper.Map(entity);
+            if (eto != null)
+            {
                 await TriggerEventWithEntity(
                     DistributedEventBus,
                     typeof(EntityDeletedEto<>),
@@ -126,6 +137,7 @@ namespace Volo.Abp.Domain.Entities.Events
                     false
                 );
             }
+        }
 
         protected virtual async Task TriggerEventsInternalAsync(EntityChangeReport changeReport)
         {