I have a problem which happens when my users register with mysql.  

When a username and password are registered, the app must show the message "User created successfully".  

But the app doesn't show any message and instead closes itself.

The username *has* been inserted into the database.  

It gives me the same problem even when I send empty data.

This my PHP response

```
$response["success"] = 1;
$response["message"] = "Username Successfully Added!";
echo json_encode($response);

```

This is my register Java code

```
        Log.d("Login attempt", json.toString());

        // json success element
        success = json.getInt(TAG_SUCCESS);
        if (success == 1) {

            Log.d("Username Successfully Added!", json.toString());
            finish();
            return json.getString(TAG_MESSAGE);
        }else{
            Log.d("Login Failure!", json.getString(TAG_MESSAGE));
            return json.getString(TAG_MESSAGE);

        }
    } catch (JSONException e) {
        e.printStackTrace();
    }

    return null;

}

```