Crash while clicking inside parameter panel for vocal modes

I’m working on the vesion of Pro Edition 1.8.1 on Linux.
When switch the parameter panel to any vocal modes editing, it first says “[any mode] has not been set up for parameter editing. Click to begin editing this vocal mode.”
When every time I click inside the panel, however, the whole software crashes(fully closes) without any prompt – If run the software again, it ask to choosing file for recovery.