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', 'd0h277rt84ept79i16o1gr9tq5', '3.145.152.98', '1746762314', '1746762314', '/xtshop/index.php?cat=c101_.html')

[XT SQL Error]