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', 'cd0u14uebjrrum14qbd8rfod12', '3.16.129.167', '1738994094', '1738994094', '/index.php?XTCsid=qg0uqqo4jksa5ns63d51ihq545&cat=c275_Navigationssystem-Akkus.html')

[XT SQL Error]