🛠 Uncatched exception should be handled gracefully

[paoloantinori]

This is a...

[ ] Feature request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Documentation issue or request

Description

Some illegal user interactions are still able to break the application.
Long term strategy is to fix each single one of them but we also need to add a generic "catch all" logic that prevents the user to see the technical error.