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', 'iq6311kaidlnt8q7d5dv6mhv44', '3.17.74.151', '1738994353', '1738994353', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c640_Netzteile.html')

[XT SQL Error]