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', 'nkf3ntsuk395acmiscd9j3kji3', '3.133.112.201', '1738998026', '1738998026', '/index.php?XTCsid=8e9c41f9ih262sbjeph8l1hut4&cat=c184_Makita-7-2Volt-Akku.html')

[XT SQL Error]