SOLVED: Jellyfin docker stopped working suddenly

[theguymadmax]

Shutdown the server

In your config folder:
Rename migrations.xml to migrations.xml.bak
In system.xml, set IsStartupWizardCompleted to false  

Code:

<IsStartupWizardCompleted>false</IsStartupWizardCompleted>

Restart the server. Once it's running again, make sure to change IsStartupWizardCompleted back to true and update to the latest version; you are way behind.