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', 's60sr82vvcjjf7e5piimc3qjt0', '216.73.217.128', '1789994510', '1789994510', '/index.php?XTCsid=adc8c520bddaa9e02a40df1e2a90f128&cat=c13_Accessoires.html')

[XT SQL Error]