After an external screen is disconnected and application returns from the background it crashes. Also happened with QT sample applications.
Looks like Qt creates ViewController for the external screen and then tries to access it, but the screen has already been destroyed by OS.
Stack trace (from Bugsnag):
Steps to reproduce:
1. Connect device to HDMI / Airplay / Or Mac recording
2. Go to background
3. Disconnect second screen
4. Return to foreground