A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Home.php

Line Number: 38

Backtrace:

File: C:\inetpub\vhosts\ons.com.tr\httpdocs\application\controllers\Home.php
Line: 38
Function: _error_handler

File: C:\inetpub\vhosts\ons.com.tr\httpdocs\index.php
Line: 338
Function: require_once