Unfair Leave Buster (help riot)

I was playing a normal blind pick game , then my character couldn't get out from base. Then I leave the game, to restart the launcher and help my teammates to win the match, but Riot puts me a penalization for something that wasn't my fault. I will apreciate your thumbs up ! HERE IS THE BUG ----------> https://www.youtube.com/watch?v=C7zSy2QJMO8