A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: shop/Cart.php

Line Number: 70

Backtrace:

File: /home/possiori/public_html/application/controllers/shop/Cart.php
Line: 70
Function: _error_handler

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