A PHP Error was encountered

Severity: Notice

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

Filename: controllers/Campaign.php

Line Number: 23

Backtrace:

File: /home/u6177619/public_html/public_subdomain/donasi/application/controllers/Campaign.php
Line: 23
Function: _error_handler

File: /home/u6177619/public_html/public_subdomain/donasi/index.php
Line: 315
Function: require_once