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', '94j8rh3um5kkgtqve3jpnkb3k0', '18.189.188.121', '1739000978', '1739000978', '/index.php?XTCsid=o64jeukdqdg9btq7j80htrr7d3&cat=c867_DAB-Digital-Radio-Akku.html')

[XT SQL Error]