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', 'm76itoqs0f4bp6v6t2o2dr0ht5', '18.191.132.118', '1738994178', '1738994178', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c24_Digital-Kamera-Akku.html')

[XT SQL Error]