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', '5ch798ta6n9ifcpig28rll6qo7', '3.135.221.122', '1738993690', '1738993690', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c751_Industrie-Akkus.html')

[XT SQL Error]