1366 - Incorrect integer value: '' for column `usr_web74_1`.`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', 'ajdj7c5p5ovrgjr7atl6k8m423', '216.73.216.41', '1762159866', '1762159866', '/popup_content.php?coID=1')

[XT SQL Error]