Попытка вызвать виртуальный метод 'java.lang.String java.lang.Object.toString ()' для ссылки на пустой объект "" ", пытаясь сжать изображение

Question

  package com.example.game.chatshat;


  import android.app.ProgressDialog;
  import android.content.Intent;
  import android.graphics.Bitmap;
  import android.net.Uri;
  import android.support.annotation.NonNull;
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.Button;
  import android.widget.TextView;
  import android.widget.Toast;


  import com.google.android.gms.tasks.OnCompleteListener;
  import com.google.android.gms.tasks.Task;
  import com.google.firebase.auth.FirebaseAuth;
  import com.google.firebase.database.DataSnapshot;
  import com.google.firebase.database.DatabaseError;
  import com.google.firebase.database.DatabaseReference;
  import com.google.firebase.database.FirebaseDatabase;
  import com.google.firebase.database.ValueEventListener;
  import com.google.firebase.storage.FirebaseStorage;
  import com.google.firebase.storage.StorageReference;
  import com.google.firebase.storage.UploadTask;
  import com.squareup.picasso.Picasso;
  import com.theartofdev.edmodo.cropper.CropImage;
  import com.theartofdev.edmodo.cropper.CropImageView;

  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;

  import de.hdodenhof.circleimageview.CircleImageView;
  import id.zelory.compressor.Compressor;


  public class SettingsActivity extends AppCompatActivity {

   private CircleImageView setting_image;
    private TextView setting_name,setting_status;
    private Button setting_changepic,setting_update_status;

    private DatabaseReference retrieve;
    private FirebaseAuth auth;
    private final static  int Gallery_Pick=1;

    private StorageReference profile_image_store;

    private Bitmap thumb_bitmap=null;

    private StorageReference thumb_image_ref;

    private ProgressDialog loadingbar;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_settings);

    auth=FirebaseAuth.getInstance();
    profile_image_store= FirebaseStorage.getInstance().getReference().child("" +
            "Profile_Pics");

    String Online_user=auth.getCurrentUser().getUid();

    retrieve= FirebaseDatabase.getInstance().getReference().child("Users").child(Online_user);

 thumb_image_ref=FirebaseStorage.getInstance().getReference().child("thumb_pics");

    setting_image=(CircleImageView) findViewById(R.id.circularImage);
    setting_name=(TextView)  findViewById(R.id.textView5);
    setting_status=(TextView)  findViewById(R.id.textView8);
    setting_update_status=(Button) findViewById(R.id.button7);
    setting_changepic=(Button) findViewById(R.id.button6);

    loadingbar=new ProgressDialog(this);

    setting_update_status.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent statusIntent=new Intent(SettingsActivity.this,Change_Status.class);
            startActivity(statusIntent);
        }
    });


    retrieve.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            String user_name = dataSnapshot.child("user_name").getValue().toString();
            String user_status = dataSnapshot.child("user_Status").getValue().toString();
            String user_image = dataSnapshot.child("user_pics").getValue().toString();
            String user_thumb = dataSnapshot.child("user_thumb_pic").getValue().toString();

            setting_name.setText(user_name);
            setting_status.setText(user_status);



            if (!user_image.equals("profile"))
            {
                Picasso.with(SettingsActivity.this).load(user_image).placeholder(R.drawable.profile).into(setting_image);
            }


        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });



    setting_changepic.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent galleryIntent=new Intent();
            galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
            galleryIntent.setType("image/*");
            startActivityForResult(galleryIntent,Gallery_Pick);
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode==Gallery_Pick && resultCode==RESULT_OK && data!=null)
    {
        Uri  Imageuri=data.getData();

        CropImage.activity()
                .setGuidelines(CropImageView.Guidelines.ON)
                .setAspectRatio(1,1)
                .start(this);
    }


    if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
        CropImage.ActivityResult result = CropImage.getActivityResult(data);
        if (resultCode == RESULT_OK)

        {       loadingbar.setTitle("uploading Your Profile Pics" );
                loadingbar.setMessage("Please wait");
                 loadingbar.show();


            Uri resultUri = result.getUri();

            File thumb_file_path_uri=new File(resultUri.getPath());


            String Online_user=auth.getCurrentUser().getUid();

            try
            {

                thumb_bitmap=new Compressor(this)
                        .setMaxWidth(200)
                         .setMaxHeight(200)
                          .setQuality(50)
                           .compressToBitmap( thumb_file_path_uri);
            }

            catch(IOException e)
            {
                  e.printStackTrace();

            }

            ByteArrayOutputStream byteArrayOutputStream=new ByteArrayOutputStream();
            thumb_bitmap.compress(Bitmap.CompressFormat.JPEG,50,byteArrayOutputStream);
            final byte[] thumb_byte=byteArrayOutputStream.toByteArray();





            StorageReference filepath=profile_image_store.child(Online_user + ".jpg");

             final StorageReference thumb_file_path=thumb_image_ref.child(Online_user+".jpg");


            filepath.putFile(resultUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onComplete(@NonNull final Task<UploadTask.TaskSnapshot> task)
                {
                    if(task.isSuccessful())
                    {
                        Toast.makeText(SettingsActivity.this,"Uploading your Profile Pic", Toast.LENGTH_LONG).show();

                        final String download_url=task.getResult().getDownloadUrl().toString();

                        UploadTask uploadTask=thumb_file_path.putBytes(thumb_byte);

                        uploadTask.addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
                            @Override
                            public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> thumb_task)
                            {

                                 String thumb_download_url=thumb_task.getResult().getDownloadUrl().toString();

                                if(task.isSuccessful())
                                {
                                    Map  update_user_data=new HashMap();
                                    update_user_data.put("user_pics",download_url);
                                    update_user_data.put("user_thumb_pic",thumb_download_url);


                                    retrieve.updateChildren(update_user_data)
                                            .addOnCompleteListener(new OnCompleteListener<Void>() {
                                                @Override
                                                public void onComplete(@NonNull Task<Void> task) {


                                                    Toast.makeText(SettingsActivity.this, "Image uploaded success", Toast.LENGTH_SHORT).show();
                                                 loadingbar.dismiss();

                                                }
                                            });
                                }

                            }


                        });



                    }
                    else
                    {
                        Toast.makeText(SettingsActivity.this, "Error", Toast.LENGTH_SHORT).show();
                        loadingbar.dismiss();
                    }
                }
            });


        } else if (resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE) {
            Exception error = result.getError();
        }
    }


}

}

всякий раз, когда я пытаюсь обновить свой профиль, приложение внезапно перестает помогать мне ... проблема возникает, когда я захожу в настройки учетной записи и пытаюсь загрузить новую картинку. Я пытаюсь сжать изображение во время загрузки и сохранения это в огненной базе.

Пожалуйста, помогите мне решить эту ошибку.