diff --git a/src/AasxPackageLogic/DispEditHelperBasics.cs b/src/AasxPackageLogic/DispEditHelperBasics.cs
index 087a0bdab..bfddbdc1e 100644
--- a/src/AasxPackageLogic/DispEditHelperBasics.cs
+++ b/src/AasxPackageLogic/DispEditHelperBasics.cs
@@ -2651,8 +2651,10 @@ public void EntityListUpDownDeleteHelper<T>(
                             if (list.Count < 1)
                                 setOutputList?.Invoke(null);
 
-                            await postActionHookAsync?.Invoke(theMenu?.ElementAt(buttonNdx)?.Name, ticket);
-
+                            if (postActionHookAsync != null)
+                            {
+                                await postActionHookAsync?.Invoke(theMenu?.ElementAt(buttonNdx)?.Name, ticket);
+                            }
                             this.AddDiaryEntry(entityRf,
                                 new DiaryEntryStructChange(StructuralChangeReason.Delete),
                                 explicitParent: explicitParent);