A PHP Error was encountered

Severity: Notice

Message: Trying to get property 'id' of non-object

Filename: controllers/Product_controller.php

Line Number: 691

Backtrace:

File: /var/www/vhosts/noktashop.ist/httpdocs/application/controllers/Product_controller.php
Line: 691
Function: _error_handler

File: /var/www/vhosts/noktashop.ist/httpdocs/index.php
Line: 328
Function: require_once