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', 'cjcn34kltjli8p8qrid5dc4vl5', '216.73.216.130', '1760943448', '1760943448', '/product_info.php?XTCsid=3547ee950f9337e348e5e07def1466f0&info=p19_10-Paper-Plates.html')

[XT SQL Error]