Thanks @ChristopherBrand for the report, and @dannymohammad for trying to reproduce. I tried as well but wasn’t able to.
There is another report of a similar issue too: https://github.com/mattermost/mattermost-server/issues/10011#issuecomment-447902237
I’ve posted to our team about it to see if they can pinpoint a potential cause based on the error. I’ll follow up with questions and/or next steps for fixing the issue.