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', '2bc99ac35b809094478fff05f849af4c', '3.142.196.27', '1714190313', '1714190313', '/product_info.php/info/p79_Linde---Kraeuter.html')

[XT SQL Error]