Black screen crash during loading screen

Played an ARAM game with friends and there was a Sona in it we won and finished the game but later when i tried to start another game and it wouldn't work after the champ pick . In the start i said there was a Sona because ive seen people talk about this to an they have been saying this happens when there are Sona's in game. I dont have a Mac like most people who report this problem but i have a LENOVO y700.