public function destroy($listener, $id)
    {
        $role = $this->model->findOrFail($id);
        try {
            if ($role->users->count() > 0) {
                throw new Exception('Unable to delete group with assigned users.');
            }
            DB::transaction(function () use ($role) {
                $role->delete();
            });
        } catch (Exception $e) {
            Log::warning($e);
            return $listener->destroyFailed(['error' => $e->getMessage()]);
        }

        return $listener->destroySucceed($role);
    }