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', 'f20qf1j3nugu6pmo6eph1smop5', '3.15.188.114', '1738994163', '1738994163', '/index.php?XTCsid=qi1463dp261ivpfjuiqmhrofh5&cat=c1140_Zahlungsterminal-Akkus.html')

[XT SQL Error]