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', 'pr21tvar67hdp38no4thr03743', '3.89.200.155', '1711688205', '1711688205', '/login.php?XTCsid=pr21tvar67hdp38no4thr03743')

[XT SQL Error]