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', 'g6msn4vu65ebimjpnpccj1nof2', '216.73.216.176', '1762196587', '1762196587', '/product_info.php?XTCsid=bf13b0b0f6f4b4114715539f49cc1fe6&info=p10_3-packs-Blow-outs.html')

[XT SQL Error]