java.lang.IllegalStateException: Fragment not attached to a context

I have a tablayout with a viewpager in my MainActivity.

My PagerAdapter looks like this:

public class MainActivityPagerAdapter extends PagerAdapter {

    public MainActivityPagerAdapter(FragmentManager fm, int numOfTabs) {
        super(fm, numOfTabs);
    }

    @Override
    public Fragment getItem(int position) {

        switch (position) {
            case 0:
                return new StoresFragment();
            case 1:
                return new OrdersFragment();
            default:
                return null;
        }
    }
}

I am coming back from another activity like this:

Intent intent = new Intent(context, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
finish(); //finishAffinity();

But then I get an java.lang.IllegalStateException in one of my Fragments in the viewpager of the MainActivity.

I read many related questions and tried to solve this. It is said, that this happens when one keeps references to Fragments outside of the PagerAdapter. But I am not doing this, as you can see in my code.

Does anyone know what I am doing wrong?

Edit - Stacktrace

FATAL EXCEPTION: main
    Process: com.lifo.skipandgo, PID: 23665
    java.lang.IllegalStateException: Fragment OrdersFragment{42c2a740} not attached to a context.
    at android.support.v4.app.Fragment.requireContext(Fragment.java:614)
    at android.support.v4.app.Fragment.getResources(Fragment.java:678)
    at com.lifo.skipandgo.activities.fragments.OrdersFragment$1.results(OrdersFragment.java:111)
    at com.lifo.skipandgo.connectors.firestore.QueryResult.receivedResult(QueryResult.java:37)
    at com.lifo.skipandgo.controllers.UserController$2.onUpdate(UserController.java:88)
    at com.lifo.skipandgo.connectors.firestore.QuerySubscription.onEvent(QuerySubscription.java:59)
    at com.lifo.skipandgo.connectors.firestore.QuerySubscription.onEvent(QuerySubscription.java:18)
    at com.google.firebase.firestore.zzg.onEvent(Unknown Source)
    at com.google.firebase.firestore.g.zzh.zza(SourceFile:28)
    at com.google.firebase.firestore.g.zzi.run(Unknown Source)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5653)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
    at dalvik.system.NativeStart.main(Native Method)

Edit: Interesting is, that the view has defenitely loaded when the error occurs. Because the error occurs about 10-15 seconds later after the fragment is shown again. I this in my orderFragment, where the error occurs:

orders = new QueryResult<UserOrder>(UserOrder.class) {
            @Override
            public void results(List<UserOrder> results) { 
orderLoadingMessage.setBackgroundColor(getResources().getColor(R.color.green)); 
    }
}

I do this in onCreateView and this result comes about 10-15 seconds after the view loaded.

from java.lang.IllegalStateException: Fragment not attached to a context