A PHP Error was encountered

Severity: Notice

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

Filename: controllers/Catalogue.php

Line Number: 1206

Backtrace:

File: /var/www/html/metrommp/application/controllers/Catalogue.php
Line: 1206
Function: _error_handler

File: /var/www/html/metrommp/index.php
Line: 315
Function: require_once