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', 'tuhmkhkg9udsbc88hi6vdl05v1', '13.59.77.83', '1738995527', '1738995527', '/index.php?XTCsid=3ea3bnp0vmbqarg8bfequsbfv5&cat=c704_Mafell-Werkzeug-Akku.html')

[XT SQL Error]