[CRASH], Game Screen Just Went Black and Never Loaded

Game of ARAM where I was Shyvana never reached the loading screen, it was just an empty black screen with my cursor still up there. Everything else on the computer was still functioning fine and it was after a normal game with Fiddlesticks. After waiting around 20 minutes, the screen was still black, I had to restart my computer to rejoin, which worked then, but I got a warning for leaving.