i recently messed up the github repository.

If your last update was ~2 weeks ago you should be fine.
Otherwise your update may fail.

You can get the most recent versions in this way:
There was no new feature in the last days. Only a more robust session management (hopefully) and internal changes.

cd ~/MagicMirror/modules/MMM-Webuntis

# Reset to match the remote repository
git fetch origin
git reset --hard origin/master
npm ci --omit=dev

I’m sorry for any inconvenience!