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', 'ci2roq5dp1f0e53ks989br2pe5', '3.141.190.247', '1738994238', '1738994238', '/index.php?XTCsid=7o9vvcq8f10964g5j8ia8t32h0&cat=c1142_Aufnahmeger--t-Akku.html')

[XT SQL Error]