A PHP Error was encountered

Severity: Notice

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

Filename: models/Artikel_model.php

Line Number: 48

Backtrace:

File: /var/www/sepasar.id/public_html/sepasar-dashboard/application/models/Artikel_model.php
Line: 48
Function: _error_handler

File: /var/www/sepasar.id/public_html/sepasar-dashboard/application/controllers/pengajar/Artikel.php
Line: 18
Function: getAll

File: /var/www/sepasar.id/public_html/sepasar-dashboard/index.php
Line: 315
Function: require_once