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', '20209e2a64888084bc093a752865fa1b', '216.73.216.251', '1752522345', '1752522345', '/shop_content.php/coID/1/content/Shipping---Returns')

[XT SQL Error]