public function removeAgent($id)
    {
        $agent = Agent::find($id);
        $agent->ticketit_agent = false;
        $agent->save();

        // Remove him from tickets categories as well
        if (version_compare(app()->version(), '5.2.0', '>=')) {
            $agent_cats = $agent->categories->pluck('id')->toArray();
        } else { // if Laravel 5.1
            $agent_cats = $agent->categories->lists('id')->toArray();
        }

        $agent->categories()->detach($agent_cats);

        return $agent;
    }