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', '720a495b7aa72f893b012b576e5906b5', '216.73.216.20', '1771725544', '1771725544', '/product_info.php?info=p3060_Isle-of-Man-Reliefkarte.html')

[XT SQL Error]