CSV Export error. Blank lines between each record

I'm getting an error when I call biblio_export for csv exporting.

I've traced it back to biblio_export making an array of objects and passing it to biblio_csv_export. The problem is that biblio_csv_export expects the results to be an array of arrays.
It is calling array_keys on each object, which fails and means that for every record, a blank line is inserted instead of the headers.