Workflowengine fails

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Nextcloud version (eg, 12.0.2): 17.0.1
Operating system and version (eg, Ubuntu 17.04): Ubuntu 16.0.4
Installed nextcloud via official docker-container

The issue you are facing:
On each upgrade I get workflowengine failed. This message also shows up on app start. I guess it comes from and old database revert I did during NC 12 or so. Its super annoying to have this. Somebody has an idea how I can get rid of the workflow engine failing?

If not, what is the workflowengine, as NC is running even without it.

Is this the first time you’ve seen this error? (Y/N): long time ago

Steps to replicate it:
update

The output of your Nextcloud log in Admin > Logging:

{"reqId":"5kXVbgCRUILQrlRbZKMX","level":3,"time":"2019-12-07T09:57:40+00:00","remoteAddr":"172.21.0.1","user":"--","app":"updater","method":"GET","url":"/core/ajax/update.php?requesttoken=E9OHBwtf37CcKlsy1U8lhXINhyFaUBmMb%2BmupTaiw6Q%3D%3AW57pUGEPjvvzazdkhXtv4yZp6EsMB3T2PLHC0X%2FW%2BtA%3D","message":"\\OC\\Updater::failure: workflowengine: Failed to enable app workflowengine","userAgent":"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0","version":"17.0.1.1","id":"5deb7afebd76e"}

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

unrelated

The output of your Apache/nginx/system log in /var/log/____:

nothing of importance