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', 'f8tol6mn7pcn2ftgk02i9q9b43', '54.163.221.133', '1711648799', '1711648799', '/login.php?XTCsid=f8tol6mn7pcn2ftgk02i9q9b43')

[XT SQL Error]