Yeah, 6 years ago when we had much older versions of GP, I wouldn’t have been as quick to suggest the plugin but these days, GP is solid enough (hank goodness) that such crashes are generally due to the plugin. Based on the report and the stack trace, my bet would be that the plugin tried to directly perform a GUI operation from the MIDI thread. While that will work occasionally, it’s a time bomb waiting to happen, totally depending on what else is going on at the time.