Match has been found! BUG!

I was in Aram champion select waiting for the count down , and then a sign went up Match has been found , with the choices finish what you are doing and go to the match as i remember , so i chosed to go the match and then the lol client went black except for the friends side which was visble ,,, when I pressed the "X" close a message showed up which was saying abandoning the match will cause you to be banned . i had no choice but to restart the client and then i was banned for 15 min . its a client bug and now i got reports score becuase of it and banned for 15 mins please do reset my report score and fix your client . Thank you for the support .