Custom error website

Hello,
is it possible to customize the error page, for example, by adding a logout button for this website?
I tried modifying /var/www/ood/apps/sys/dashboard/public/500.html, but unfortunately, it didn’t work.

Yes you can override any page, though I’m not sure if it’s going to fix your issue.

https://osc.github.io/ood-documentation/latest/customizations.html#overriding-pages

There should be a tmp HTML file on the same machine owned by the user you’re trying to login as that should have more information about your crash.