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', '5nfug7oji7olsn590t10lqjqs1', '3.15.226.174', '1738995321', '1738995321', '/index.php?XTCsid=3ea3bnp0vmbqarg8bfequsbfv5&cat=c1008_LiFePO4-Caravan-Akku---Zubeh--r.html')

[XT SQL Error]