Crash on mac. Patch 7.15

Hello, I didn't play League of Legends for 1 month and recently I wanted to play some normal games with my friend just to have fun. Unfortunaly when I tried to connect in the game, the game wouldn't load. I can't play League of Legends because it crashes everytime. Even when I start a game alone I can't even connect. I'd like to know if you could do something. If you want more information : When I connect in a 5v5 game I block at 7% then I hear the game's sounds but on my screen I can only see my spells, the time, the kills and the minimap. But I can't see the map. The map is replaced with the loading screen. And then after like 4 secs the game crashes. It's really annoying me. My mac : OS X El Capitan Version : 10.11.6 I'd really apriciate if you could help ! :D