League of Legends error code 0U explained

The client is a mystery somtimes.

Image via Riot Games

Getting into a game of League of Legends can be a challenging task sometimes. Unlike other games where the lobby is a part of the game itself, League has a separate client interface that allows players to interact with their friends without actually launching the game.

Though this is convenient for players with slower PCs, bugs that affect the Riot client can prevent players from joining matches even if the servers are functioning properly. The origins of error code 0U are unclear, but it’s been affecting users from all around the world for some time now.

Riot has acknowledged the issue and confirmed it’s working on a fix, but that doesn’t mean that you have to wait with your hands tied until the developer finds a permanent solution to the problem.

There are a couple of temporary fixes you can try out, but none of them can fix the error for good. The chances of error 0U reappearing are still high and you’ll need to wait for Riot to patch out this minor annoyance.

How to error code 0U in League of Legends

Community managers or Riot devs haven’t disclosed an official solution method yet, but community members that reached out to Riot’s support line were advised to run the Hextech Repair Tool.

Hextech Repair Tool is a utility program developed by Riot that automatically runs a troubleshooting session. The Hextech Repair Tool has multiple tools at its disposal to detect corrupt game files and can reinstall a patch or the game itself.

Try adding League as a Firewall exception and also repatching the game. If these two options don’t seem to fix your problem, we recommend reinstalling League through the Hextech Repair Tool. The tool also collects all of your game logs, which you can send to Riot support to help pinpoint the root of this issue.

But the above method isn’t guaranteed to work for everyone. Even players who successfully bypassed the error by reinstalling were greeted with it once again after some time.

Keep an eye on the support page to track Riot’s progress regarding the error. If you’re determined to play the game, you can continue to try your luck by attempting to log in after receiving the error.

About the author

Jerome Heath

Associate Editor. Brit stranded thousands of miles from home on a tiny little island that looks like a sweet potato. League of Legends? He's aware of it. VALORANT? Might have heard of it. Counter-Strike? Sounds vaguely familiar.