Game crash with critical error

I've never experience this but after the last patch I get computer crashing glitches from League. It only happens when lots of spells are on the screen at once. The game will freeze then the pop up saying the program must close due to a critical error comes up. I tried both reinstalling and using a back up copy and got the same results.

If anyone has a fix suggestion (if possible) let me know. I like to play ranked but it may not be possible with the current patch.