🐛 Bug Report

Describe the bug

When trying to use OIDC to login to my self-hosted instance, I am properly directed to my OIDC provider, after login, I get redirected to the login page with nothing happening.

To Reproduce

My configuration :

    kanban:
      image: ghcr.io/kanbn/kan:latest
      container_name: kanban
      environment:
        - NEXT_PUBLIC_BASE_URL=https://***********************
        - BETTER_AUTH_SECRET=*******************
        - POSTGRES_URL=postgres://**************:**********@db:*********/kanban
        - NEXT_PUBLIC_ALLOW_CREDENTIALS=false
        - NEXT_PUBLIC_DISABLE_SIGN_UP=false
        - NEXT_PUBLIC_DISABLE_EMAIL=true
        - BETTER_AUTH_ALLOWED_DOMAINS=***********
        - OIDC_CLIENT_ID=kanban
        - OIDC_CLIENT_SECRET=********************************
        - OIDC_DISCOVERY_URL=https://*****************/realms/******/.well-known/openid-configuration
      depends_on:
        - db
      restart: unless-stopped

Expected behavior

After logging in, be redirected to the application. I have https://kanban.**********.**/* as valid redirect URI in my configuration there.

Screenshots

Environment (please complete the following information):

• OS:
  • Client : Fedora 43 Workstation
  • Server : Ubuntu server 24.04
• Browser : Firefox
• Node version : same as container
• App version/commit : docker latest

Additional context

My OIDC server is Keycloak, working with several other apps.

I get the following logs from the app :

OIDC profile: {
  id: '***************************',
  emailVerified: true,
  image: undefined,
  exp: 1770471259,
  iat: 1770470959,
  auth_time: 1770470958,
  jti: '****************************',
  iss: 'https://************/realms/***************',
  aud: '**********',
  sub: '***************',
  typ: 'ID',
  azp: 'kanban',
  sid: '******************',
  at_hash: '*****************',
  acr: '1',
  email_verified: true,
  name: '**************',
  preferred_username: 'ombrelin',
  locale: 'fr',
  given_name: '************',
  family_name: '*********',
  email: '************'
}
2026-02-07T13:29:19.027Z ERROR [Better Auth]: TypeError: Cannot read properties of null (reading 'id')

Thanks in advance for your help.