Crash at loading screen

Hey Riot, I've been having this issue for awhile now. Since the patch which added the battle academia skins, I think. Anyway, what will happen is when I get into the loading screen for a match I'll get an error message saying that the process has stopped crashing the game. While the error persists, I am unable to exit league and the only way to access my computer again is to restart it completely. Thank you for your time