In the root of the /config folder there are a bunch of xml files. One of more of them are probably empty now and you can try delete them to force them to be recreated.
Jellyfin 10.10.6 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)