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', 's0ev6jvn7hlj7g16kivk6858j1', '3.147.89.242', '1738995815', '1738995815', '/index.php?XTCsid=mgdqk1fhm8rf8rhaciivk3tpt2&cat=c672_Tablet-PC---E-Book-Akku.html')

[XT SQL Error]