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', 'n910r2nvartvol6hmsfjbgknb7', '18.191.240.134', '1738999751', '1738999751', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c185_Makita-9-6Volt-Akku.html')

[XT SQL Error]