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', '1q84ftac0n6cept0fd0m4t14t2', '216.73.216.115', '1761548654', '1761548654', '/xtshop/product_info.php?info=p1075_.html')

[XT SQL Error]