Critical Error

Since yesterday I can't play LOL due to this error _"A critical error has occurred and the process must be terminated."_ I tried to play a custom and everything worked fine, I didn't receive that error, or any error ar all. But as soon as I joined a 5v5 game it appeared. I tried to repair my client but that didn't solve my problem. I'm using an Asus laptop with Windows 10 if that's relevant at some point. When that error appears I can't switch tabs (even tho I can see my programs with ALT+TAB), I can't exit LOL. I can just move my mouse around. I have to restart my laptop over and over again trying to reconnect to game but with no succes. Any help?
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