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', '65986e6927b932af7d300dadfee54a37', '216.73.216.116', '1752280280', '1752280280', '/shopping_cart.php/language/de')

[XT SQL Error]