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', '55t0ephsqjoc892qfe3bdmfjp2', '3.131.13.161', '1738997869', '1738997869', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c771_Wireless-Router-Akku.html')

[XT SQL Error]