No mastery 7, skip waiting stats bug

So I needed one more S to get the last token for rank 7, (playing as Akali) and it so happened that this game was my best one, I went 45-11-10 and was wholeheartedly expecting at least a S-. But at the end of the game I got the "skip waiting for stats" and I waited for at least 5 minutes before hitting Skip. This made me extremely mad, as I never got my token. I had played about 7 games previous trying and trying and to be denied by something that goes back as far as 2012 is prepestrous.