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', '0gth1t2eclo413a7g1dma0occ0', '216.73.216.130', '1760928631', '1760928631', '/index.php?XTCsid=33509f1bee4ee2cbb673a74e5faae0d4&cat=c2_Decoration.html')

[XT SQL Error]