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', 'evbpap7s4184db900jpokgb4v2', '3.147.63.162', '1738998777', '1738998777', '/index.php?XTCsid=rkdf8qfiujodbcb5st13ohfmn6&cat=c1188_Lautsprecher-Akku.html')

[XT SQL Error]