System: Ubuntu 19.10, QT 5.13.2
How to crash:
1. Open QLC built from current code
2. Switch to VC and add a widget or change a property
3. Open a new project (with or without saving)
4. Add a widget to the vc or switch to the function manager
It seems that the program is not properly reset when a new project is created, but I did not investigate the issue deeper.