1366 - Incorrect integer value: '' for column `mapshopatlogis`.`whos_online`.`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', '52d69499ac0e8363d9a2fc9d21fa90cb', '216.73.216.3', '1767300550', '1767300550', '/product_info.php?info=p2770_Zypern-Reliefkarte.html')

[XT SQL Error]