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', 'giukbvu2k97f1aq6bku1383ma4', '216.73.216.176', '1762382280', '1762382280', '/index.php?XTCsid=1edacbd1b1da241cee49f7b785c52673')

[XT SQL Error]