I tried to fetch data using facebook api into form inputs.
Now, everything went just fine until I tried to also fetch the location of the current user.

If the current user have shared his location (Where he is living), then I get no problems. However, if the user hasn't shared his location on facebook, I am getting an error:
Uncaught TypeError: Cannot read property 'name' of undefined

Here is the code I've been using. If you have any idea how to solve it, please comment here :)

<div id=fb-root></div>

<script>

  // Additional JS functions here

  window.fbAsyncInit = function() {

    FB.init({

      appId      : '*******', // App ID

      status     : true, // check login status

      cookie     : true, // enable cookies to allow the server to access the session

      xfbml      : true  // parse XFBML

    });



    FB.getLoginStatus(function(response) {

  if (response.status === 'connected') {



    FB.api('/me', function(response) {

  document.getElementById(user_login).value=FB -  + response.username;

  document.getElementById(user_email).value=response.email;

  document.getElementById(first_name).value=response.first_name;

  document.getElementById(last_name).value=response.last_name;

  document.getElementById(user_url).value=response.link;

  document.getElementById(fbid).value=response.id;

  if(response.location !== 'undefined')

  {

    document.getElementById(location).value=response.location.name;

    alert(response.location.name);

  }

  document.getElementById(registerform).submit();



});



  } else if (response.status === 'not_authorized') {

    alert('error');

  } else {

    alert('Please Log In!');

  }

 });



  };



  // Load the SDK Asynchronously

  (function(d){

     var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];

     if (d.getElementById(id)) {return;}

     js = d.createElement('script'); js.id = id; js.async = true;

     js.src = //connect.facebook.net/en_US/all.js;

     ref.parentNode.insertBefore(js, ref);

   }(document));

</script>