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', 'coc6rcm19dlmijodk62uqpg783', '216.73.216.70', '1752610187', '1752610187', '/product_info.php?info=p10_3-packs-Blow-outs.html&XTCsid=e65207aee44f142683bacdd3544c84a8')

[XT SQL Error]