It looks like there’s a problem with a previous update but there’s not update.log in the /data/ folder or in /updater-data/.
I did a “upgrade:checkpoint --list” and turns out there are not checkpoints. So reverting back is also not an option.
I don’t think it’s related to my problem though. It’s a known issue apparently: php updater/application.php upgrade:detect fails · Issue #482 · owncloud/updater · GitHub
