1366 - Incorrect integer value: '' for column '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', 'a851b453a5cd785dc7b1c85fc39beab9', '3.141.41.187', '1713506032', '1713506032', '/product_info.php/info/p21_Heide---Buchweizenhonig.html')

[XT SQL Error]