It’s really hard to reproduce this bug
The only thing I can say is it ALWAYS happens when editing in the piano roll.
It occurs not frequently, but sometimes it can happen 2 or 3 times per hour. Sometimes only one time a week.
When does this bug occurs?
It can happen when selecting notes in the piano roll ( with the left mouse button pressed )
It happens sometimes when clicking on a note.
Sometimes when editing midi controller curves.
I never think of copying the resulting crash report, but this time I did it and here’s the crash report