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', '72e6b3e61943898c8fc6da7fb3189f73', '216.73.216.251', '1752521420', '1752521420', '/shopping_cart.php/language/en')

[XT SQL Error]