A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: common/Frontend.php

Line Number: 10

Backtrace:

File: C:\xampp\htdocs\application\controllers\common\Frontend.php
Line: 10
Function: _error_handler

File: C:\xampp\htdocs\index.php
Line: 315
Function: require_once