A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/language.php

Line Number: 15

Backtrace:

File: D:\smartdeal_web_prod\application\controllers\language.php
Line: 15
Function: _error_handler

File: D:\smartdeal_web_prod\index.php
Line: 292
Function: require_once