ARAM Game crashed, not in match history.

I was in an ARAM game with my girlfriend and right before we won the game, we were at enemy nexus about to destroy it, and the game froze for several minutes. I closed out of the game and tried to get back into it and after I clicked on reconnect it was a black screen. After several minutes of trying to reconnect the game immediately black screened, my girlfriend was in it the whole time and it was frozen. What the hell happened? I have absolutely no idea what kind of bug that is. Now it doesn't show up in our match histories.