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', 'ffd8jh4aqrmir8uu2oub9640u1', '13.58.192.30', '1739000768', '1739000768', '/index.php?XTCsid=u26kusssenv9nf8n7cr2rtvfn3&cat=c1115_Worx-Werkzeug-Akku.html')

[XT SQL Error]