Forum login via Gitlab account not working - error 500

I wanted to login via my Gitlab account to respond to a topic. I couldn’t because the Gitlab login page is giving my a error 500. See screenshot https://img.frl/iu0jz

Is it me or should the be fixed on Gitlab’s side?

It’s a problem on GitLab’s side. What is your GitLab.com username? It will make it easier for me to find the associated error and raise a bug report