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', '23k0bafb990r1nct7368ji1q62', '3.149.214.156', '1738997993', '1738997993', '/index.php?XTCsid=nj57khd41hu8ciniagj0kmvlc3&cat=c1246_Werkzeug.html')

[XT SQL Error]