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', 'e8k9qanudjmosdqhe9rj0name3', '3.15.22.209', '1738993834', '1738993834', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c841_Li-ion-3-6V---3-7V-Rundzellen.html')

[XT SQL Error]