http://bugs.winehq.org/show_bug.cgi?id=29609
--- Comment #21 from Someone scrimekiler@yahoo.fr --- By the way if you look for 'league of legends crash 127.0.0.1" on a search engine, you'll find hundreds of results like this one :
http://www.playonlinux.com/fr/topic-10056-League_of_Legends_crash_after_cham...
This bug exist from a long time and a lot of people know the workaround.
They only didn't post it here, that's the problem...