I was playing league as usual until I took a 30 minute brake, when I tried to play again after champion select ended instead of a loading screen I got a black screen and another windows with the message "A critical error has occurred and the process must be terminated. Would you like to create a crash dump to aid the developers in troubleshooting the issue?"
I am on windows 10 with an AMD graphics card, I don't remember anything happening in my 30 minute brake between when the game was working and when it wasn't.
Edit: I've reinstalled the game but it didn't help.
And some other things I've tried:
Firewall is not enabled.
Windows is updated.
Graphic drivers are updated.
Computer has been restarted