ARAM bug?? [CRASH]

I have no idea whats going on, but I already tried to start 2 ARAM games, and everytime when the game starts to load, my screen is turning black and gives kind of an error. After that I get an message: Game crash, please try to reconnect to the game. After like 15 minutes my game isnt found anymore and there's a defeat in my match history. Can someone tell me what's going on, or how I can fix this?