1366 - Incorrect integer value: '' for column 'customer_id' at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 'ju8adfj00ses5n0hsvis56ff57', '216.73.217.120', '1793718274', '1793718274', '/product_info.php?XTCsid=7c604026da355cfd6a094c68b431572d&info=p8_100-Placemats.html')

[XT SQL Error]