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', 'd93e0dd39000f3d5df4b8a16adcc2cb6', '23.20.220.59', '1710839120', '1710839120', '/index.php?cat=c_.html')

[XT SQL Error]