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', '77d61209b8edc0a8bbe4b9897b591042', '216.73.216.28', '1763615820', '1763615820', '/product_info.php?info=p2736_Bosnien-Reliefkarte.html')

[XT SQL Error]