1366 - Incorrect integer value: '' for column `CP_as15`.`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', '92a7j3bc23opuno1t67761dhi1', '3.144.94.19', '1738998305', '1738998305', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c1218_M--hroboter-Zubeh--r.html')

[XT SQL Error]