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', '3rqihvtf8sjotu7oo2jo358j37', '216.73.216.87', '1765670336', '1765670336', '/index.php?XTCsid=3547ee950f9337e348e5e07def1466f0&cat=c13_Accessoires.html')

[XT SQL Error]