Bug editing relationships

I experienced a bug trying to edit a relationship between two tables using the relationship overview page. 

I had a relationship highlighted, because i wanted to delete it. After i pressed "DEL" i accidentally double clicked it. This caused the relationship editor to open, but it continues to load forever and rendered the program unable to respond (alt+ctrl+del to force close it). 

I think that what happened is, that the program is trying to open a deleted relationship, and thus freezes (loading endlessly).