[CLIENT] Black Screen At Champ Select

So I was just searching for a normal game 5v5 when it promoted me to accept,so I accepted and by the time everyone have done so it sent me to the champ select screen,for a brief moment I could see the chat,the champions and everything but then everything went black and all I could click was the chat and the close button,i was forced to close and got a ban as there's nothing I can do,this is the only time for a bug to occur to me.