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', 'ru13ua6g9c2opfqato8tqj83f4', '216.73.216.147', '1751764033', '1751764033', '/product_info.php?info=p10_3-packs-Blow-outs.html&XTCsid=38717c4dd62e88001622b2c7b8b8372a')

[XT SQL Error]