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', 'g2m8881ku9lha2c2mo3oht45d7', '216.73.216.94', '1751835771', '1751835771', '/xtshop/product_info.php?info=p783_.html')

[XT SQL Error]