A PHP Error was encountered

Severity: Notice

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

Filename: models/User_review_model.php

Line Number: 113

Backtrace:

File: /var/www/vhosts/noktashop.ist/httpdocs/application/models/User_review_model.php
Line: 113
Function: _error_handler

File: /var/www/vhosts/noktashop.ist/httpdocs/application/controllers/Ajax_controller.php
Line: 147
Function: delete_review

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