Hitting key com. for "edit active part only" in Arrange

Yes, I know that I don’t need to hit the key command for “Edit Active Part Only” in the arrange window, but once in a while I accidentally hit it while the arrange window is the active window and Cubase (6.5.4) will crash. This has happened enough times to me to know it is a bug and not some other mistake or process I made. Obviously, it works as should when I’m in the key editor.