Not a bug
Software error: Invalid number of database users. Expected at least 1.
I now get the above error when trying to log on from a browser, or a wrong password error when loggin on from nextcloud apps.
Customer support service by UserEcho
Sounds like something wrong happened to the MySQL database. I would suggest a backup restore. After that, I would recommend updating to the latest FileRun version.
I think this is a symptom of a bigger problem with my system. Probably not filerun related.
The above was me FYI.