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', 'pi410104l2h31icedi0fm1hho4', '3.21.92.87', '1738995006', '1738995006', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c475_Spielekonsolen-Akku.html')

[XT SQL Error]