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', 'fd232709c1c9fcc2e05a8d82d64a3aa7', '216.73.216.108', '1763414892', '1763414892', '/product_info.php?info=p2706_Lettland-Reliefkarte.html')

[XT SQL Error]