Codeigniter : This page isn’t working localhost redirected you too many times.

ketika logout selalu redirect ke halaman login seperti gambar ini <a href=' https://goo.gl/FrhzQd '> https://goo.gl/FrhzQd </a> sudah coba hapus cookie tapi masih sama..

 <?php
defined('BASEPATH') OR exit('No direct script access allowed');

class login extends CI_Controller {

		function __construct(){
        parent::__construct();
    }
    public function index(){
    	$id_user = $this->session->userdata("id_user");
    	if(!empty($id_user)){
				$data["title"] = "DASHBOARD";
				$data["subtitle"] = "Dashboard";
  			$this->load->view('/template/header', $data);
  			$this->load->view('/template/dashboard');
  			$this->load->view('/template/footer');
  		}else{
  			$this->load->view('/template/login');
  		}
  	}

	public function login(){
		$username = $this->input->post('username');
		$password = $this->input->post('password');
		$hasil = $this->mlogin->login($username,$password);
		foreach ($hasil as $row) {
			$id_user    = $row->id_user;
      $nama_user  = $row->nama_user;
      $email      = $row->email;
      $no_phone   = $row->no_phone;
      $username   = $row->username;
      $password   = $row->password;
      $jabatan    = $row->jabatan;
		}
		if (empty($hasil)) {
			$this->session->set_flashdata("notification","<div class='alert alert-success m-b-sm'>
                    <button type='button' class='close' data-dismiss='alert' aria-label='Close'><span aria-hidden='true'>×</span>
                    </button>
                    <strong>Gagal!!</strong> username dan password salah !!
                  </div>");
		} else {
			$this->session->set_userdata('id_user',$id_user);
			$this->session->set_userdata('nama_user',$nama_user);
      $this->session->set_userdata('email',$email);
      $this->session->set_userdata('no_phone',$no_phone);
			$this->session->set_userdata('username',$username);
			$this->session->set_userdata('password',$password);
			$this->session->set_userdata('jabatan',$jabatan);
		}
		redirect(base_url(), $data);
	}

  public function logout() {
		$this->session->unset_userdata('id_user');
    $this->session->unset_userdata('nama_user');
    $this->session->unset_userdata('email');
    $this->session->unset_userdata('no_phone');
    $this->session->unset_userdata('username');
    $this->session->unset_userdata('password');
    $this->session->unset_userdata('jabatan');
    $this->session->set_flashdata('notification', '');
		$this->session->sess_destroy();
		redirect(base_url());
  }

}