A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Question.php

Line Number: 145

Backtrace:

File: /data/www/wwwroot/dax/application/www/controllers/Question.php
Line: 145
Function: _error_handler

File: /data/www/wwwroot/dax/index.php
Line: 357
Function: require_once