Supabase Auth errorSupabase Auth: session_not_found

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Why the session is gone, and the fix

1. 01

   The user signed out somewhere else

   “Session to which the API request relates no longer exists.” Supabase docs, Auth error codes (session_not_found)

   signOut ends every session for the user by default, so other tabs and devices get session_not_found at their next request. Use scope local when only this device should sign out.

   // Sign out on this device only
   await supabase.auth.signOut({ scope: 'local' });

2. 02

   A session limit ended it

   On Pro plans and up, time-boxed sessions, an inactivity timeout or single session per user in the Auth settings end sessions on the server, checked at the next refresh. Check those settings if users are signed out on a schedule.

3. 03

   An admin or script deleted the session

   “This can occur if the user has signed out, or the session entry in the database was deleted in some other way.” Supabase docs, Auth error codes (session_not_found)

   Deleting rows from auth.sessions, or deleting the user, removes the session the app still holds. Sign the user out locally and let them sign in again.

4. 04

   The app keeps retrying with the old tokens

   Also check: a server or middleware that reads an old auth cookie keeps failing. Clear the cookie on this code instead of retrying.

Checked against the vendor’s docs on November 9, 2026: Supabase docs: Auth error codes; Supabase docs: User sessions; Supabase reference: signOut (scope).

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Related: Supabase users logged out (refresh token) · Supabase Auth session missing · Supabase session lost on refresh · Supabase Storage bucket not found