Unexpected character 'e' after consenting OIDC action.

[DaanSelen]

Description

Hello everyone,

I am using Gitea inside Kubernetes using the helm chart.
What I have setup looks to be all in working order but I am getting the following error:

There was an error processing the authorization request: invalid character 'e' looking for beginning of value. If this error persists, please contact the site administrator.

The settings for the OIDC connector should all be in order (with disabling the PKCE challenge).

The relevant serverside logs:

025/07/21 16:29:25 routers/web/auth/oauth.go:112:SignInOAuthCallback() [I] Failed OAuth callback: (internal) invalid character 'e' looking for beginning of value
2025/07/21 16:29:25 HTTPRequest [I] router: completed GET /user/oauth2/OIDC/callback?state=<SNAP>&code=<SNAP> for 10.222.222.240:48422, 303 See Other in 151.4ms @ auth/oauth.go:76(auth.SignInOAuthCallback)
2025/07/21 16:29:25 HTTPRequest [I] router: completed GET /user/login for 10.222.222.240:48422, 200 OK in 3.4ms @ auth/auth.go:184(auth.SignIn)

What am I to do?
Gitea version: 1.24.3
Gitea chart: gitea-12.1.2

Gitea Version

1.24.3

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

Git Version

git version 2.49.1

Operating System

Debian 12 on Kubernetes 1.33

How are you running Gitea?

Kubernetes Helm

Database

PostgreSQL

[techknowlogick]

Thanks for opening up this issue, which OIDC server are you using?

[DaanSelen]

I am using Entrust IDaaS (OpenID Connect) with the following settings:

I hope this helps!