Thank you @mcrabino for submitting the error report as we can use that to fix the crash, but the underlying cause will likely result in topology problems in the output S-57 file and requires further investigation. Following @PSheatsley's recommendation, a support ticket would facilitate further communication and, if possible, sharing the data so we could pinpoint the cause.
I recommend saving the current state of your data if you're able to share it, and then try using the S-57 topology we provide and validate the topology (insuring you're working with a single scale band of your data and not in your NIS with multiple scales present). The S-57 exporter should handle each case, but this approach might help clean it up so you can proceed for now.
