Field 'http_referer' doesn't have a default value

               ADOConnection.Execute(INSERT INTO whos_online (full_name, ip_address, time_last_click, last_page_url, user_agent, session_id, time_entry) VALUES ('Gas...) % line   81, file: class.db.php
            db.db_query(INSERT INTO whos_online (full_name, ip_address, time_last_click, last_page_url, user_agent, session_id, time_entry) VALUES ('Gas...) % line  189, file: class.db.php
         db.db_perform(whos_online, Array[10]) % line  648, file: class.layout.php
      layout.whos_online() % line    0, file: 
   call_user_func_array(Array[2], Array[0]) % line  761, file: smarty_internal_templatebase.php
Smarty_Internal_TemplateBase.__call(whos_online, Array[0]) % line   17, file: index.php
categories.whos_online() % line   17, file: index.php