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', 'r5mtajfn2tuo3lg5us4fk45440', '3.147.13.194', '1738999947', '1738999947', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c1146_Strapex-Werkzeug-Akku.html')

[XT SQL Error]