Crash when deleting function referenced by instanced object.

Open sample project or create UUserWidget named 'TestPureUserWidget' with following property.

	UPROPERTY(EditAnywhere, Instanced, Category = Test)
	UObject* InstancedObject;

1. Right click on the content browser -> select "Blueprint Class" -> search "pure" and select "TestPureUserWidget" to create the WidgetBlueprint.
2. Right click on the content browser -> select "Blueprint Class" -> search "trail" and select "AnimNotifyState_Trail" to create the InstacedObjectBlueprint.
3. Add a variable of type 'InstacedObjectBlueprint' to the Widget BP
4. Add a function to the InstacedObjectBlueprint, compile and save (Bind function to above variable)
5. Call the function in WidgetBlueprint, compile and save
6. Now, go to InstancedObjectBlueprint, and delete the function, press compile button,
7. crashes