Hello Elisa,
The issue was because of the ACF Upload field, these have no value and that made RO CSVI fall apart

I have already applied the patch and the export finishes. I am not sure if you need the patch for another site so I have it attached.
Let me know if all is fine.
Kind regards,
RolandD
=========================
If you use our extensions, please post a rating and a review at the
Joomla! Extension Directory