Java.lang.IllegalArgumentException: этот источник уже был добавлен другим наблюдателем

Может ли кто-нибудь правильно объяснить мне это выражение ... Кажется, это проблема, с которой я столкнулся в настоящее время.

MediatorLiveData#addSource

Starts to listen the given source LiveData, onChanged observer will be called when source value was changed.

onChanged callback will be called only when this MediatorLiveData is active.

If the given LiveData is already added as a source but with a different Observer, IllegalArgumentException will be thrown.

В настоящее время у меня в качестве модели ViewModel (называется SplashViewModel)

package com.testapp.testapp.ui.splash;

import com.testapp.testapp.repository.HealthTipRepository;

import javax.inject.Inject;

import androidx.lifecycle.LiveData;
import androidx.lifecycle.MediatorLiveData;
import androidx.lifecycle.ViewModel;


public class SplashViewModel extends ViewModel {

    private final HealthTipRepository healthTipRepository;

    // Load Status will be used to fill up the progress bar inside the Activity
    private final MediatorLiveData<Integer> loadStatus = new MediatorLiveData<>();
    
    @Inject
    SplashViewModel(HealthTipRepository healthTipRepository) {
        this.healthTipRepository = healthTipRepository;
    }

    LiveData<Integer> observeLoadStatus() {
        loadStatus.addSource(healthTipRepository.createHealthTips(), healthTips -> {
            int currentValue = loadStatus.getValue();
            int newValue = currentValue != null ? currentValue + 25 : 25;
            loadStatus.setValue(newValue);
        });
    }
}

В действии у меня вот что:

package com.testapp.testapp.ui.splash;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.widget.ProgressBar;

import com.testapp.testapp.R;
import com.testapp.testapp.storage.PrefManager;
import com.testapp.testapp.ui.BaseActivity;
import com.testapp.testapp.ui.FactoryViewModel;

import javax.inject.Inject;

import androidx.annotation.Nullable;
import androidx.lifecycle.ViewModelProviders;
import butterknife.BindView;

// Base Activity has already injected the Dagger component
public class SplashActivity extends BaseActivity {

    @BindView(R.id.splash_progress)
    ProgressBar progressBar;

    @Inject
    FactoryViewModel factoryViewModel;
    private SplashViewModel viewModel;

    // PrefManager is responsible for managing shared preferences. It exposes a .get Method
    @Inject
    PrefManager prefManager;

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

        ButterKnife.bind(this);

        viewModel = ViewModelProviders.of(this, factoryViewModel).get(SplashViewModel.class);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // Performs checks to turn on location. The viewmodel is placed in the
        // onREsume to ensure that even when we leave the activity to turn on the
        // location and return, we can always start the viewmodel
        boolean turnedOnLocation = false;
        if (!turnedOnLocation) {
            startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
        }

        boolean appSetup = prefManager.get("app_setup", false);
        if (!appSetup) {
            viewModel.observeLoadStatus().observe(this, status -> {
                progressBar.setProgress(status + "");
            });
        }
    }
}

Все работает так же гладко, однако, когда я выхожу из этого действия и возвращаюсь, приложение вылетает с ошибкой:

Process: com.testapp.testapp, PID: 29865
java.lang.RuntimeException: Unable to resume activity {com.testapp.testapp/com.testapp.testapp.ui.splash.SplashActivity}: java.lang.IllegalArgumentException: This source was already added with the different observer
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3609)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3649)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1663)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6524)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:888)
 Caused by: java.lang.IllegalArgumentException: This source was already added with the different observer
    at androidx.lifecycle.MediatorLiveData.addSource(MediatorLiveData.java:89)
    at com.testapp.testapp.ui.splash.SplashViewModel.fetchSensorLocations(SplashViewModel.java:25)
    at com.testapp.testapp.ui.splash.SplashViewModel.observeLoadStatus(SplashViewModel.java:17)
    at com.testapp.testapp.ui.splash.SplashActivity.observeViewModels(SplashActivity.java:121)
    at com.testapp.testapp.ui.splash.SplashActivity.onResume(SplashActivity.java:77)
    at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1355)
    at android.app.Activity.performResume(Activity.java:7138)

Я буду очень признателен за объяснение, почему я продолжаю получать эту ошибку.

Спасибо