1366 - Incorrect integer value: '' for column `pella-ware`.`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', '2vkjb553h4a51ft8166d7fher6', '3.15.5.183', '1713545940', '1713545940', '/login.php?XTCsid=2vkjb553h4a51ft8166d7fher6')

[XT SQL Error]