Hi hippowombat.
I’ve reviewed your crash reports, and you have experienced this crash previously during the Previews. The first time was this past Sunday while on Preview 3. Unfortunately I am not familiar with this crash as it only appears to be occurring for you, and only on your specific project (at least at the moment). I recommend you review your project log files for any additional information, or run it through a debugger. If you find more information that points to this being an engine bug, and you can provide a reproduction case, please file a bug report by following the link in my signature.
Cheers