Error: Could not Initialize Graphic Device bug.

Today when I started playing I noticed that after champion select is finished and we are about to go in game a message Error: Could not Initialize Graphic Device would show up and stop the game from running, and after I press OK I need to reconnect to the game. This happened for most of the games I played today and it seems to happen when I minimize the league client and open some other program before the game starts but I'm not really sure. This is the error that I see every time I minimize the game before the start https://ibb.co/r64GG1p.