Seeing VAN Missing -117 pop up in the middle of your game? That means Riot Vanguard isn’t running, and since it’s required for the game run properly, your client will close automatically.
To fix this, make sure Vanguard is running properly before launching the game. If you’ve got background programs that might be interfering, try performing a clean boot to clear out any conflicts.
If you’ve tried that and the issue still sticks around, scroll down and send us a ticket so our Player Support team can help you out.