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', 'gi8kpaqtlr96dla27ebbb8dds1', '216.73.216.113', '1775084239', '1775084239', '/product_info.php?XTCsid=15cbbc13723f7bc63afaf1294f637517&info=p6_100-Paper-Plates.html')

[XT SQL Error]