A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Userlogin.php

Line Number: 137

Backtrace:

File: /home/stoutnails/public_html/application/controllers/Userlogin.php
Line: 137
Function: _error_handler

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