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', '7q1vpn8qen2qdghhv7m0hdu5c4', '216.73.216.180', '1766658049', '1766658049', '/product_info.php?XTCsid=38f09672db884903e3803adf9d076819&info=p12_33-feet-crape-paper.html')

[XT SQL Error]