Gameplay Crash

Yo,Riot i was playing a ranked game,then i make alt+tab to start youtube for my songs,then i clicked to back in game and my game crashed and didnt give to come back..Now i have a Leaver Buster because of this bug...Please clear out this Buster I don't deserve to have this thing..Btw It's not my first game when game crashed or something..It's second or third time.... I'm saying again,Please clear this Leaver Buster