单击RecyclerView项目时，我需要将用户ID从Firebase从一个片段传递到另一个片段。我尝试通过Bundle执行此操作，但收到以下错误：

java. lang.NullPointerException：尝试在空对象引用上调用虚方法'java.lang.Object android.os.Bundle.get（java.lang.String）'

发送片段：

FirebaseRecyclerAdapter firebaseRecyclerAdapter =
    new FirebaseRecyclerAdapter<User, FindFriendsViewHolder>(options) {
  @Override
  protected void onBindViewHolder(@NonNull FindFriendsViewHolder holder, int position, @NonNull User model) {
    holder.setUserName(model.getName());
    Picasso.get().load(model.getImageURL()).placeholder(R.drawable.ic_baseline_person_24).into(holder.userImage);

    holder.mView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String userid = getRef(holder.getBindingAdapterPosition()).getKey().toString();
            Fragment fragment= new AnotherUserFragment();

            Bundle args = new Bundle();
            args.putString("userid", userid);

            AddUserFragment addUserFragment = new AddUserFragment();
            addUserFragment.setArguments(args);

            FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
            transaction.replace(R.id.main_body, fragment);
            transaction.addToBackStack(null);
            transaction.commit();

        }
    });
  }

接收片段：

Bundle args = getArguments();
String receiverUserId = args.get("userid").toString();
Toast.makeText(getActivity(), "your id: " + receiverUserId, Toast.LENGTH_SHORT).show();