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', 'hgeco5a5pc4009rfv150o6ge13', '3.137.217.235', '1738997397', '1738997397', '/index.php?XTCsid=8e9c41f9ih262sbjeph8l1hut4&cat=c841_Li-ion-3-6V---3-7V-Rundzellen.html')

[XT SQL Error]