Retrieving facebook friends returns empty list

I'm trying to retrieve a list of all friends, but it always returns a zero size list... No exception nor fail...

I'm using following permissions:

Permission[] permissions = new Permission[] {
            Permission.BASIC_INFO,
            Permission.READ_FRIENDLISTS
    };

and I'm using following code:

private static OnFriendsListener mOnFriendsListener = new OnFriendsListener()
{
    @Override
    public void onComplete(List<Profile> friends)
    {
        L.d(FacebookHelper.class, "OnFriendsListener::onComplete");
        BusProvider.getInstance().post(new FacebookEvent(Type.Friends, friends));
    }

    @Override
    public void onException(Throwable throwable)
    {
        L.d(FacebookHelper.class, "OnFriendsListener::onException");
        L.e(FacebookHelper.class, new Exception(throwable));
    }

    @Override
    public void onThinking()
    {
    }

    @Override
    public void onFail(String reason)
    {
        L.d(FacebookHelper.class, "OnFriendsListener::onFail");
    }
};

public static void getFriends(SimpleFacebook simpleFacebook)
{
    PictureAttributes pictureAttributes = Attributes.createPictureAttributes();
    pictureAttributes.setType(PictureType.SMALL);

    Properties properties = new Properties.Builder()
            .add(Properties.ID)
            .add(Properties.FIRST_NAME)
            .add(Properties.LAST_NAME)
            .add(Properties.PICTURE, pictureAttributes)
            .add(Properties.BIRTHDAY).build();

    simpleFacebook.getFriends(properties, mOnFriendsListener);
}

Can anybody help me out with this problem?