Applied this change and "Edit Menu Item" overlay dialog correctly shows "You must choose a project" resp. "You must choose a room." error message, now without an exception.
Go to /home/menu/configure/custom/ and also to /home/menu/configure/global/ and try:
- Add Link, Save Again
- Add Application, Save Again
- Add Divider, Save Again
- Add Conpherence, Save Again
- Add Link, Save Again
- Add Motivator (Cat Facts), Save Again
- Add Form, Save Again
- Order Items
- Activate/Disable Built-in Home (unrelated)