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', 'kqf1p940op5gcgunib0aad9uh1', '3.145.15.129', '1738995611', '1738995611', '/index.php?XTCsid=7o9vvcq8f10964g5j8ia8t32h0&cat=c817_verschiedene-Hersteller.html')

[XT SQL Error]