Hey Rudi,
thanks for reporting that crash. We have discovered some weird behaviour as well and that is why we released a hot fix this weekend. You can download the latest version here: https://community.bildhuus.com/t/version-1-0-0-preview-7/
In general it is very helpful for us that when you encounter the crash you press Windows + R on your keyboard and then type %TEMP%\aspect-log.html to open our log file. If you send this aspect-log.html to bugs@bildhuus.com we can see in more detail what happened in the background.
Please try the preview 7. Maybe the crash is fixed.
me.