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', 'ht1r0hknon42jsb3plkmv93435', '216.73.216.144', '1781071195', '1781071195', '/xtshop/product_info.php?info=p720_.html')

[XT SQL Error]