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', 'evignd62hok1ee33r6hqumdso1', '216.73.216.180', '1766176042', '1766176042', '/product_info.php?XTCsid=3547ee950f9337e348e5e07def1466f0&info=p19_10-Paper-Plates.html')

[XT SQL Error]