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', 'f407b243353342d573ab251596126d99', '216.73.216.191', '1758209532', '1758209532', '/product_info.php/info/p4019_3D-Reliefkarten-Konfigurator.html?refID=1')

[XT SQL Error]