Wrongly timed out of finding a game because of Client Bug

I clicked "Accept" while queuing and the champion select screen was all black and nothing was clickable so I closed the client and now I've got to wait 6 minutes to find a match.

What happened was I was editing my Masteries when the game was found. I clicked "Accept" and THEN the "You have unsaved changes to your Masteries" message came up and I clicked "No". Then the character screen came up and it was blacked out.