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', '8kakh67u7fh0btl4nl6uas22k6', '18.191.135.39', '1738995688', '1738995688', '/index.php?XTCsid=qg0uqqo4jksa5ns63d51ihq545&cat=c475_Spielekonsolen-Akku.html')

[XT SQL Error]