Remove an item from a chest

Hello,
I was trying to remove an item from a chest.

Code (Text):

e.getDestination().remove(e.getItem());
 

It worked fine when there were no items of that type in the chest. But as soon as i put an item in the chest it didn't work anymore... Is that a bug? Am I doing sth wrong?
Help is appreciated
Thanks

 

Oh thank you! I'll do that immediately