TankAuth/Tank-Auth — pull request #71 by atehnix (2013-12-27 22:13:07+00:00)
Title: Update auth.php

Codeigniter release of 2.1.3:

Fixed a bug (#1314) - Session Library method sess_destroy() didn't destroy the userdata array.

$this->tank_auth->logout() contains the function sess_destroy(); So after you have called this, you cannot use set_flashdata() in $this->_show_message().