[Client] Accepted ARAM, but then blackscreened.

Didn't get a picture of this, as it simply was a black screen. Queued up solo for an aram, and after a few tries, everyone finally accepted. I heard the noise like it was going through to the champ select screen, and then... nothing. The border of the client was normal, like it was loading in, but the center was just black. The sound even stopped. Went to exit the client, but it gave the notice about leaving a game, so I decided to give it a minute, see what happened. Lo and behold, it loaded just fine. After a bit, it went to the normal pre-game loading screen. I've yet to try to recreate this bug, but it was a bit frustrating not knowing what champ I had, nor what masteries I was using.