For my case the one field didn’t have any “Options” in the array when suite tried to auto map the headers.
So removing the header row will work.
What I ended up doing was enabling errors in php.ini - to get the error - but then in Import/forms.php I added a try/catch around the problem.
Yeah, I know not ideal- but essentially if suite can’t auto map it then it should just skip it, not screwup the entire import.
It would be nice to be able to choose if the first row is a header row or not, or whether to auto-map.