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', '51nun988ffms7bpq5ed5pgu511', '3.147.104.248', '1714052074', '1714052074', '/login.php?XTCsid=51nun988ffms7bpq5ed5pgu511')

[XT SQL Error]