I am getting error but empty statusText, here is my code

 var ajaxUrl = 'https://graph.facebook.com/me?access_token=' + accessToken
                        $.ajax({
                          url: ajaxUrl,
                          dataType: 'json',                       
                          success: function(user){
                            alert('h');
                          },
                          error: function(xhr, ajaxOptions, thrownError){
                            alert(xhr.statusText);
                          }
                        });