A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: helpers/my_helper.php

Line Number: 47

Backtrace:

File: C:\Inetpub\vhosts\khansehat.af\httpdocs\application\helpers\my_helper.php
Line: 47
Function: _error_handler

File: C:\Inetpub\vhosts\khansehat.af\httpdocs\application\controllers\Home.php
Line: 152
Function: refer

File: C:\Inetpub\vhosts\khansehat.af\httpdocs\index.php
Line: 317
Function: require_once