如何解决这个问题？尝试在空对象引用上调用虚拟方法'double android.location.Location.getLatitude（）'

Question

请帮助我找出此错误

  

试图在空对象引用上调用虚拟方法double android.location.Location.getLatitude()

    private void updateList() {
        FirebaseRecyclerOptions<User> userOptions = new 
                  FirebaseRecyclerOptions.Builder<User>()
                .setQuery(counterRef,User.class)
                .build();
        mLastLocation = null;
        adapter = new FirebaseRecyclerAdapter<User, ListOnlineViewHolder>(userOptions) {

            @Override
            protected void onBindViewHolder(@NonNull ListOnlineViewHolder viewHolder, int position, final User model) {
                if (model.getEmail().equals(FirebaseAuth.getInstance().getCurrentUser().getEmail()))
                    viewHolder.txtEmail.setText(model.getEmail() + " (me)");
                else
                    viewHolder.txtEmail.setText(model.getEmail());

                viewHolder.itemClickListener = new ItemClickListener() {
                    @Override
                    public void onClick(View view, int position) {
                        if (!model.getEmail().equals(FirebaseAuth.getInstance().getCurrentUser().getEmail())) {
                            Intent map = new Intent(ListOnline.this, MapsActivity.class);
                            map.putExtra("email", model.getEmail());
                            map.putExtra("lat", mLastLocation.getLatitude());
                            map.putExtra("lng", mLastLocation.getLongitude());
                            startActivity(map);

                        }
                    }
                };
            }

-----------------------------------------------------------


import android.view.View;
import android.widget.TextView;


import androidx.recyclerview.widget.RecyclerView;


public class ListOnlineViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

    public TextView txtEmail;
    ItemClickListener itemClickListener;
    public ListOnlineViewHolder(View itemView) {
        super(itemView);

        txtEmail = (TextView)itemView.findViewById(R.id.txt_email);
        itemView.setOnClickListener(this);
    }

    public void setItemClickListener(ItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    @Override
    public void onClick(View view) {
        itemClickListener.onClick(view,getAdapterPosition());


    }
}


  java.lang.NullPointerException: Attempt to invoke virtual method 'double android.location.Location.getLatitude()' on a null object reference
        at mariposa.yashida.com.ListOnline$1$1.onClick(ListOnline.java:195)
        at mariposa.yashida.com.ListOnlineViewHolder.onClick(ListOnlineViewHolder.java:27)
        at android.view.View.performClick(View.java:5265)
        at android.view.View$PerformClick.run(View.java:21534)
        at android.os.Handler.handleCallback(Handler.java:815)
        at android.os.Handler.dispatchMessage(Handler.java:104)
        at android.os.Looper.loop(Looper.java:207)
        at android.app.ActivityThread.main(ActivityThread.java:5765)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)