A PHP Error was encountered

Severity: Warning

Message: Undefined array key "HTTP_REFERER"

Filename: controllers/Main.php

Line Number: 26

Backtrace:

File: /home/central3/public_html/app/controllers/Main.php
Line: 26
Function: _error_handler

File: /home/central3/public_html/index.php
Line: 254
Function: require_once