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', '3mg94m6vss04ogj1dffgqiglp1', '52.14.107.15', '1738997529', '1738997529', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c867_DAB-Digital-Radio-Akku.html')

[XT SQL Error]