Fatal error: Uncaught Error: Call to a member function result() on bool in /home/hjdewaar/public_html/dissertation/system/application/models/book_model.php:102 Stack trace: #0 /home/hjdewaar/public_html/dissertation/system/application/controllers/book.php(65): Book_model->get_by_slug('labyrinth-a-phd...') #1 /home/hjdewaar/public_html/dissertation/system/core/CodeIgniter.php(309): Book->__construct() #2 /home/hjdewaar/public_html/dissertation/codeigniter.php(203): require_once('/home/hjdewaar/...') #3 {main} thrown in /home/hjdewaar/public_html/dissertation/system/application/models/book_model.php on line 102