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', 'pnjekv5ra8bubse6l71ij0oio6', '18.188.254.182', '1738995984', '1738995984', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c1239_Smartwatch-Akku.html')

[XT SQL Error]