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', '9u59qi2cjiap665rp6h26l24o2', '18.189.170.17', '1713546990', '1713546990', '/login.php?XTCsid=9u59qi2cjiap665rp6h26l24o2')

[XT SQL Error]