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', '2df145e2a7730f6c65adc049496e150c', '216.73.216.3', '1767334181', '1767334181', '/shop_content.php/language/en/coID/1/content/Shipping---Returns')

[XT SQL Error]