I'm sorry that InDesign is crashing when you try to export. Thank you for sending your InDesign file. I was able to export it without InDesign crashing and without any error.
It may help to export with the latest version of in5, 3.8.20. You can download it from here:
We identified an issue with a recent macOS update that affects license checks. The fix is included in this latest version of in5 in5 version. Updating may also help with the crashing.
If InDesign is still crashing, then try saving the file as an IDML file and back as an INDD file: