A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Cart.php

Line Number: 118

Backtrace:

File: /var/www/vhosts/vanji.com.tw/httpdocs/application/controllers/Cart.php
Line: 118
Function: _error_handler

File: /var/www/vhosts/vanji.com.tw/httpdocs/index.php
Line: 315
Function: require_once