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', 'jbt3v7lesp6u4to9k0vj1ftls3', '216.73.216.118', '1761503713', '1761503713', '/product_info.php?XTCsid=3dfedf8e10ab51b65faa7b7d7332d93a&info=p10_3-packs-Blow-outs.html')

[XT SQL Error]