A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Cms.php

Line Number: 612

Backtrace:

File: /var/www/html/application/frontend/controllers/Cms.php
Line: 612
Function: _error_handler

File: /var/www/html/index.php
Line: 315
Function: require_once