codeigniter会话数据在ssl上丢失

I have session data lost issue on codeigniter. When user logged in, it stores session data but as soon as user goes to another page the session data is lost. What can caused this ? This issue appeared when i switched to site ssl.

Config file:

$config['cookie_prefix']    = '';
$config['cookie_domain']    = '';
$config['cookie_path']      = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']  = FALSE;

$config['base_url'] = 'https://blabla.com/';

Login proccess

public function login_user_process(){
        $params = [
            'user_email' => $this->input->post('user_email'),
            'password' => $this->input->post('user_pass')
        ];
        $this->load->library('form_validation');
        $this->form_validation->set_rules('user_email', 'E-Posta', 'required');
        $this->form_validation->set_rules('user_pass', 'Password', 'required');
        if ($this->form_validation->run() == false) {
            $this->session->set_flashdata('status', '0');
            $this->session->set_flashdata('msg', 'Username and password field can not be null.');
            redirect('login', 'refresh');
        }

        $check_activation = $this->db->where('user_email', $params['user_email'])->get('aj_users')->row_array();
        if ( $check_activation['activation_code'] != null ){
            $this->session->set_flashdata('status', '0');
            $this->session->set_flashdata('msg', 'Please active your account by email we have sent on registration. If you can not reach activation email please click <a href="'.base_url().'resend_activation" class="resendActivation">resend activation code</a>');
            redirect('login', 'refresh');
        }

        $query = $this->index_model->loginCheck($params['user_email'], $params['password']);
        if ( $query != null ){
            $session_data = array(
                'email' => $params['user_email'],
                'user_role' => $query['user_role'],
                'is_logged' => 1,
                'agent' => $_SERVER ['HTTP_USER_AGENT'],
                'user_id' => $query['table_id']
            );
            $this->session->set_userdata($session_data);
            if ( $query['user_role'] == 'OPERATOR' ){
                redirect('../operators/profile_edit', 'refresh');
            }
            if ( $query['user_role'] == 'USER' ){
                redirect('../user/my_account', 'refresh');
            }
        }else{
            $this->session->set_flashdata('status', '0');
            $this->session->set_flashdata('msg', 'Wrong username and password.');
            redirect('login', 'refresh');
        }

it was working on non ssl version. And now its not working.