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', '5hsjun1dgarv2fpv91f9t1dmu3', '18.220.12.210', '1738994472', '1738994472', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c158_Werkzeug-Akku.html')

[XT SQL Error]