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Error codeLeague of LegendsWindows PC
League of Legends: "Unexpected error with the login session"
Another client copy stuck in the background
Riot says this login error tends to show up when another copy of the League or Riot client is stuck running in the background.
Fix it
How to fix "Unexpected error with the login session"
Press Alt+F4 on the client and choose Sign out, not Exit.
Press Ctrl+Shift+Esc and end every RiotClientServices.exe and League of Legends process.
Open the client and log in again.
If it comes back, also close KillerServiceNetwork.exe.
From League of Legends's help pages: support.riotgames.com, in our words. Checked on 11 November 2026. If the steps do not help, League of Legends's own support is the next stop.
More
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- VAN -81Vanguard trouble starting or staying connected
- VAN 9003Secure Boot is turned off
- VAN 1067Vanguard hit an error checking your system
- VAN 0Vanguard couldn't verify your PC
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