How to understand why Qt program crashes?

Question

Qt

I have a Qt program compiled with MinGW. For some users, the program just crashes without any error message. I understand that somewhere there is an error in the code, but it is not clear in which direction to dig.
The situation is also complicated by the fact that the application is in the background and hangs in the tray, so users do not even understand at what point it crashes.
How to catch the cause of the crash in Qt (you need a solution that will work at least on Windows)?

Answer 1

Logging.

Answer 2

Using Google Breakpad with Qt