A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: models/Mbooks.php

Line Number: 2958

Backtrace:

File: /var/www/html/application/models/Mbooks.php
Line: 2958
Function: _error_handler

File: /var/www/html/application/controllers/Book.php
Line: 236
Function: get_pocket_count

File: /var/www/html/index.php
Line: 299
Function: require_once