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', '4321d09cb05fb69ccaf83c95a748d6cc', '216.73.216.121', '1751957731', '1751957731', '/shop_content.php/coID/1')

[XT SQL Error]