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', 'cde4add241144794dde5b41f520f4070', '216.73.216.121', '1771179948', '1771179948', '/product_info.php/info/p439_Reliefkarten-Konfigurator.html?refID=2')

[XT SQL Error]