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', 'rpd96kn000cia2p5h6is3l86h5', '216.73.216.60', '1760461565', '1760461565', '/index.php?XTCsid=950ffb10fb43fc07eb6836be05601b5f')

[XT SQL Error]