Can you please provide some details about your issue?
Which action triggers the crash?
Does it also crash while working on a brand new .muse file?
If this is file specific issue, would you mind sharing your .muse file with us so that we can investigate and try fixing it?
For sharing the file you can follow the steps explained here - https://forums.adobe.com/docs/DOC-8652 and send the link to me in a private message.
For doing a private message hover the mouse on my picture and click "message".