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', 'iuuesbh1930cug60409nikbh56', '13.58.141.38', '1738997558', '1738997558', '/index.php?XTCsid=c8tsstf8ajiodlgrn3rqsr62b1&cat=c1147_Linstrap-Werkzeug-Akku.html')

[XT SQL Error]