A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: product/detail.php

Line Number: 105

Backtrace:

File: /home/ftp0kv0pyaeiu3f6tapk0pk2vu0rppyzaiehiiu/wwwroot/application/client/views/product/detail.php
Line: 105
Function: _error_handler

File: /home/ftp0kv0pyaeiu3f6tapk0pk2vu0rppyzaiehiiu/wwwroot/application/client/controllers/Product.php
Line: 122
Function: view

File: /home/ftp0kv0pyaeiu3f6tapk0pk2vu0rppyzaiehiiu/wwwroot/index.php
Line: 316
Function: require_once