Right… I have the same issue for latest, 23.9.1, 23.8.1
Will need to write in to the image maintainer jarischaefer/docker-librenms
For a working version, you can use version 23.5.0 (I have tested this as a fresh install on my Syno after your forum post)
jarischaefer/docker-librenms:23.5.0
Adjust the LibreNMS docker command to the following:
docker run \
-p 8668:80 \
-e DB_HOST=libredb \
...
...
--name librenms \
-d \
--restart always \
jarischaefer/docker-librenms:23.5.0
Let me know if v23.5.0 works on your end