After doing some MIDI recording for a bit, eventually you will encounter the following exception:
WARNING: Rosegarden::Exception: "No data found for property pitch" at src/base/Event.h:544
Qt has caught an exception thrown from an event handler. Throwing
exceptions from an event handler is not supported in Qt. You must
reimplement QApplication::notify() and catch all exceptions there.
terminate called after throwing an instance of 'Rosegarden::Event::NoData'
Aere Greenway first noticed this.
I reproduced by recording two devices to different tracks. I recorded some segments, then deleted them and recorded some more. It took a fair amount of playing around before this happened. The crash occurred while recording was underway.