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', '8ie3a13pv089svf1jqjjaognj3', '18.117.188.100', '1738996192', '1738996192', '/index.php?XTCsid=e08p0achgq0tssilr9o0o9bta6&cat=c1082_Diverse-Werkzeugakku-Ladeger--te.html')

[XT SQL Error]