Client stopped but still went on

So I just played one game, actually, I was going to play one game. I was going to trade with someone, but even before all players finished picking champions, the screen has shut down, I couldn't control (clicking didn't work; I couldn't change the summoner spell, couldn't trade the champion) and the game began. The game started but nothing appeared, seemed like it just stopped running. I just waited for something like bugsplat, but nothing appeared on my screen. When I restarted my computer, the game was already remade, and I guess my teammates reported me.