Can't destroy the delegated target during a bdragend event (the error 'BDragCtx is undefined' appears)

I want to destroy an element via the bdragend event but an error appears on this event.
It seem's that bdragend is called 3 times :

• the first times, the context exist
• the other times, the context is unkown (because it's removed).

I do an example : http://jsfiddle.net/nq5P4/