A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Page.php

Line Number: 218

Backtrace:

File: /home/sadashim/public_html/app/controllers/Page.php
Line: 218
Function: _error_handler

File: /home/sadashim/public_html/index.php
Line: 315
Function: require_once