error when mapping MARC fields

Hello,
I am trying to get the MARC module working. When I attempt to map the MARC fields to Drupal node fields on the MARC tab of my content type admin page I get the following error when I submit the form:
user warning: Incorrect integer value: '' for column 'multiple' at row 1 query: INSERT INTO marc_content_type_mapping (content_type, content_field, mfdid, multiple, cck) VALUES ('biblio', 'menu-title', '3', '', '')

I have tried mapping MARC fields to the biblio content type, the delivered content types and new custom content types and I get the same error. Any ideas?