1366 - Incorrect integer value: '' for column `shop_db3`.`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', '5665515e3465f36d5f5cc6fc9e593266', '18.223.21.5', '1714230549', '1714230549', '/shop_content.php?coID=2&XTC')

[XT SQL Error]