Not Being Able To Lock In On The New Client

On the client when the queue pops up you accept as usual, right? but once your in game and you're banning or locking in and you have like 10-5 (seconds because your team was making a strat) sometimes when you try to lock in you get an error something about this champion has cannot be selected and then you dodge and that's a 5 or 20 min leaver buster #Feelsbadman