WWWHHHHAAT ISSS THIIS

So, I get a game crash with this error

http://gyazo.com/776f4185d6ee2152b562d180ccfb14a4

Apparently the ezreal on the other team crashed with the same error only it said twitch instead of ezreal (I was playing twitch in that match).

It said my data got corrupted and I have to reinstall league. Seriously, what the actual hell is this.