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', 'u0lcu7dloevb7jd82lmei29pk7', '3.141.21.141', '1738998927', '1738998927', '/index.php?XTCsid=b08vstu7leg8ef8i43caoskln6&cat=c21_Handy---Smartphone-Akku.html')

[XT SQL Error]