This appears to be the same issue as a post earlier today:
My best guess is a change to nextcloud.sh in the latest version of MiaB is causing the problem.
I just realized you can update to v55, and at least have that, I just need to figure out the command to run to upgrade to a version other than the latest version.
And as I recommended in the other post, please create an issue on GitHub, if there isn’t one there already (it would be right at the top).