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', 'q7rvc0ujhef0poh2p3ig9fd3b4', '3.145.191.128', '1738999645', '1738999645', '/index.php?XTCsid=mkl8qqqorbnshicuaf45rnrdo2&cat=c25_Notebook-Akku.html')

[XT SQL Error]