"Showactivitydates should not be null" error when finished restoring a course

Hello,

I am having some trouble restoring courses at the moment which is something that hasn't happened before. I recently updated my moodle to 3.11 and now I'm starting to get this error at the end of the restoring process of courses:

I have no clue what caused this error and don't know how to resolve it. Any help is appreciated.