Game starting, but immediately crashes

So right now, I've queued up for an ARAM game. Everything is fine, I get in lobby and fix my stuff. The loading screen goes well too. But the second I've got in game, it crashes. I try to get back in, BAM. Another crash. I try to restart my client, BAM. It crashes again when I get in game. I've tried 7-8 times by now, but it's always the same result. What is causing that?
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