League of Legends - How to Fix 'A Critical Error Has Occurred'

For more information, check out this guide:

A short tutorial on how to fix the "A Critical Error Has Occurred" error from League of Legends (LoL).
Leave a comment if you have any questions.

Wallpaper from this video:

🛠️ Equipment I use: (Mic, PC Components, etc.)

[KrozFX]

love launching a ranked and having that :)!

[kashiwa]

i got the same problem upon starting Legends of Runeterra, any tips on how to make it work? I've been playing it for a week without any problems and the problem occured out of nowhere :/

[tucancap]

LoL is just straight broken on win 7 dual core cpu. Bunch of disconnects and eventually crash with error message almost every game. It's like the game kills itself.
This is a bug that Riot has to fix.

[Yume]

hey, I had the same problem but with Legends of Runeterra, I tried to do this but didn't work, its any kind of special issue?

[yassinebahri]

Windows 7 please it happening beetween 3~10 min evrey game

[cyrusiithegreat]

i dont have disable full screen option just disable desktop composition.

[gamerx]

Cant go in that firewall thing. Any help?

[far]

What about 7 i did this and it doesnt even open cilent

[DeadTeemoReported]

windows 7 or maybe rito trolling us since 10 years now we had no problem with windows 7, apparenlty they changed something because they dont care about us low budget old pc gamers. great way to treat your old summoners

[miguette]

thank you bro i hope your family has a nice chrismas

[deqgames]

When i try to do this i get black screen and then error: a critical error has occurred and the process must be terminated
but my game work fine and i can watch my personal replays from match history - how to fix that?

[welderluis]

Funcionou só na primeira partida, depois voltou a sait

[hamzanaveed]

i installed windows 10 recently now my league game dosent work. My loading screen gets stuck at 40 percent and slows my pc after 5 minutes system error occurs and i cant get in the game. help me bro

[elwyfinch]

The lobby screnn has bugged i got black screen

[Gavallier]

Love you, i almost lost my promo cuz of this. It just kept appearing, the game was at 2 mins whem i got in

[TaigaGalette]

what does he mean add them? add them to what also just did a full fresh install still same error

[stojanov]

can you help me i cant find the league of legends in the firewall
pls help me faster

[rounick]

UPDATE 12/30/2019
I have checked the game and my theory has been true, the anti-cheating League of Legends is having incompatibility with Windows 7, and only this Operating System, since I have tested the game in Windows 10 and this does not present this problem, at same as Windows 8, but the case of Windows 7 is special, since there must be some application or service that causes this error, For those who have few PCs they can use modified operating systems such as the case of LITE operating systems or MiniOs, I have had experience using these systems and all my life I have used this type of systems I have not had problems when emulating games or applications, so here I leave the data and I hope you can solve the error, Greetings!

[ziraknoori]

When I load into a game I’m in the game for max 30 seconds and the. It’s crashes and says this stuff I need help

[jirorivera]

Bro I have this Problem on League while im on ingame my game just close and it says League of legends tm client Stopped working



Can anyone help?