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', 't6tpn3dob6pjd2pqkam3m6ikr2', '3.17.173.208', '1738994488', '1738994488', '/index.php?XTCsid=3urkhm9sdqaa68rq8ocuqac7t6&cat=c920_Roboter---Staubsauger-Zubeh--r.html')

[XT SQL Error]