converting bitmap image works in activity but generates null reference error on fragment

Question

Converting bitmap to string and compressing bitmap is worked fine in activity but in fragment activity, it generates null object reference error

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: com.news.androidapp, PID: 5777
                  java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
                      at com.news.androidapp.News_Yeb.convertBitmapToString(News_Yeb.java:161)
                      at com.news.androidapp.News_Yeb.onClick(News_Yeb.java:110)

Extending Fragment

public class News_Yeb extends Fragment implements OnClickListener {
    Button bt_register;
    TextInputLayout til_name;
    ImageView iv_profile;
    String name, profile;
    RequestQueue requestQueue;
    boolean IMAGE_STATUS = false;
    Bitmap profilePicture;
    View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.news_yeb, container, false);
        til_name = view.findViewById(R.id.til_name_reg);
        iv_profile = view.findViewById(R.id.im_profile);
        bt_register = view.findViewById(R.id.bt_register);

        iv_profile.setOnClickListener(this);
        bt_register.setOnClickListener(this);

        return view;
    }

Adding two onClick event using switch case, one is for imageview and another is for submit button

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.im_profile:

        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        startActivityForResult(intent, 1000);
            break;

        case R.id.bt_register:
            name = til_name.getEditText().getText().toString();
            if (     validateName(name)       )

            {
         final ProgressDialog progress = new ProgressDialog(getActivity());
                progress.setTitle("Please Wait");
                progress.setMessage("Creating Your Account");
                progress.setCancelable(false);
                progress.show();
                convertBitmapToString(profilePicture);
                RegisterRequest registerRequest = new RegisterRequest(name, profile, new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        Log.i("Response", response);
                        progress.dismiss();
                        try {
                            if (new JSONObject(response).getBoolean("success")) {
                                Toast.makeText(getActivity().getApplicationContext(), "Account Successfully Created", Toast.LENGTH_SHORT).show();
                                finish();
                            } else
                                Toast.makeText(getActivity().getApplicationContext(), "Something Has Happened. Please Try Again!", Toast.LENGTH_SHORT).show();
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                });
                requestQueue.add(registerRequest);

            }
     break;  
    }

}

Connecting with PHP/Mysql

public class RegisterRequest extends StringRequest {

    private static final String REGISTER_URL = "..";
    private Map<String, String> parameters;

    public RegisterRequest(String name, String mobile, String email, String image, Response.Listener<String> listener) {
        super(Method.POST, REGISTER_URL, listener, null);
        parameters = new HashMap<>();
        parameters.put("name", name);
        parameters.put("image", image);
    }
    @Override
    protected Map<String, String> getParams() throws AuthFailureError {
        return parameters;
    }
}

Converting bitmap image into a ByteArrayOutputStream and then converting stream into a byte array

private void convertBitmapToString(Bitmap profilePicture) {
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    profilePicture.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
    byte[] array = byteArrayOutputStream.toByteArray();
    profile = Base64.encodeToString(array, Base64.DEFAULT);
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1000 && resultCode == Activity.RESULT_OK && data != null) {
        //Image Successfully Selected
        try {
            //parsing the Intent data and displaying it in the imageview
            Uri imageUri = data.getData();//Geting uri of the data

                    InputStream imageStream = getActivity().getApplicationContext().getContentResolver().openInputStream(imageUri);//creating an imputstrea
            profilePicture = BitmapFactory.decodeStream(imageStream);//decoding the input stream to bitmap
            iv_profile.setImageBitmap(profilePicture);
            IMAGE_STATUS = true;//setting the flag
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}