A PHP Error was encountered

Severity: Notice

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

Filename: site/nav.php

Line Number: 11

Backtrace:

File: /home/buempliz/public_html/application/views/site/nav.php
Line: 11
Function: _error_handler

File: /home/buempliz/public_html/application/controllers/Schulkreis.php
Line: 48
Function: view

File: /home/buempliz/public_html/index.php
Line: 315
Function: require_once