Thank you for your post.
I have responded to your identical post on the FileMaker Go forum at:
In essence, this appears to be an issue if the device is pointed at the QR Code prior to the Insert from Device script step. The camera will beep, no scan occurs, and FileMaker Go will crash and return to the iOS home screen a majority of time. If you don't have the camera pointed at the QR Code prior to Insert from Device, then the issue will not occur. See the link for more details.
This actually appears to be the same issue after testing for that exact condition. Thanks for the reply.
An entry in the Known Bugs List has been linked to this Issue Report. Any Comments/Questions/Suggested Corrections should be posted here or in a new thread. Please do not post such comments to the Known Bugs List thread.