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', '58h0ol90imm43lbr4al77jc1n0', '216.73.216.28', '1764988418', '1764988418', '/product_info.php?XTCsid=75dc59d6a30660e0992222d2318ca53e&info=p19_10-Paper-Plates.html')

[XT SQL Error]