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', 'u0c5624a5kds2undl5k6g6rbe6', '216.73.216.82', '1752527598', '1752527598', '/')

[XT SQL Error]