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', '6u52rf8fkp1e5dl2lu480fiv17', '216.73.216.36', '1773706519', '1773706519', '/xtshop/index.php?cat=c68_.html')

[XT SQL Error]