Destroy() in Events list

I have a user object placed on a window(w_1). This user object displays Destroy() in event list(screenshot attached). Script in this event was

Call u_parent::destroy

In the parent script, some of the objects are being destroyed. If we navigate to parent script, PB crashes. I would like to remove the destroy event from the dropdown event listing. When I removed the below code from Edit Source

on userobject.destroy

call u_parent::destroy

end on

I do not see the ***call parent::destroy*** script but the destroy event is still there.

Please advice.