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', '3535p13o7dq4183851q4pdrc34', '18.188.243.41', '1738997508', '1738997508', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c1175_Dremel-Werkzeug-Akku.html')

[XT SQL Error]