Hard crashing upon going from Queue to Champion select

So, this shit has happened to me twice today. The first in normals earlier today. Figured it was just the odd bug, league flipping out as per usual. Now it's happened to me again, upon entering a ranked match. It's accepted, it moves to a black client, and then CTD immediatly, zero crash report, no message, nothing. Just gone. It's only happened today, but now I'm behind a 30 minute wait timer and am -10 LP in the hole. Working on running a repair, but christ riot.