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', '6uniaf51fun0kt4ufdq4kl8j51', '18.191.234.191', '1713561450', '1713561450', '/login.php?XTCsid=6uniaf51fun0kt4ufdq4kl8j51')

[XT SQL Error]