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', '9bk7vvob92iof5pno9tfc0vdu7', '3.15.226.174', '1738994389', '1738994389', '/index.php?XTCsid=3urkhm9sdqaa68rq8ocuqac7t6&cat=c841_Li-ion-3-6V---3-7V-Rundzellen.html')

[XT SQL Error]