Проблема с RecyclerView в PagerAdapter

В общем у меня есть фрагмент с ViewPager и TabLayout. на страничках есть фрагменты с текстом и фрагменты с RecyclerView. так вот при первом запуске фрагмента все подгружается нормально. После же выхода из фрагмента кнопкой назад и запуска заново, Фрагмент с RecyclerView перестает работать.

Код: Фрагмент:

package com.starikov.gidtj.NewTowns;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.starikov.gidtj.R;
import com.starikov.gidtj.TownLists.Dushanbe.HistoryOfDushanbe;
import com.starikov.gidtj.TownLists.Dushanbe.MuseumsOfDushanbe;
import com.starikov.gidtj.TownLists.Dushanbe.ParksAndMonumentsOfDushanbe;
import com.starikov.gidtj.TownLists.Dushanbe.WalkingTourOfDushanbe;
import com.starikov.gidtj.adapters.TownsPagerAdapter;
public class Dushanbe extends Fragment {
    @Override
    public View onCreateView(LayoutInflater infalater, ViewGroup container, Bundle savedInstanceState) {
        return infalater.inflate(R.layout.dushanbe, container, false);
    }
    @Override
    public void onResume() {
        super.onResume();
        getActivity().setTitle("Душанбе");
    }
    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        View view = getView();
        assert view != null;
        final TabLayout tabLayout = view.findViewById(R.id.tab_layout);
        tabLayout.addTab(tabLayout.newTab().setText("История Душанбе"));
        tabLayout.addTab(tabLayout.newTab().setText("Музеи"));
        tabLayout.addTab(tabLayout.newTab().setText("Парки и памятники"));
        tabLayout.addTab(tabLayout.newTab().setText("Пешая прогулка по Душанбе"));
        final ViewPager viewPager = view.findViewById(R.id.pager);
        Fragment list[] = {
                new HistoryOfDushanbe(),
                new MuseumsOfDushanbe(),
                new ParksAndMonumentsOfDushanbe(),
                new WalkingTourOfDushanbe()
        };
        final TownsPagerAdapter adapter = new TownsPagerAdapter(getActivity().getSupportFragmentManager(), list);
        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        viewPager.setOffscreenPageLimit(1);
        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }
            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
            }
            @Override
            public void onTabReselected(TabLayout.Tab tab) {
            }
        });
    }
}

Адаптер:

package com.starikov.gidtj.adapters;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.view.ViewGroup;
public class TownsPagerAdapter extends FragmentStatePagerAdapter {
    private Fragment mFragments[];
    public TownsPagerAdapter(FragmentManager fm, Fragment fragments[]) {
        super(fm);
        this.mFragments = fragments;
    }
    @Override
    public Fragment getItem(int position) {
        return mFragments[position];
    }
    @Override
    public int getItemPosition(Object object) {
        return POSITION_NONE;
    }
    @Override
    public int getCount() {
        return mFragments.length;
    }
    @Override
    public void destroyItem(ViewGroup viewGroup, int position, Object object) {
        super.destroyItem(viewGroup, position, object);
    }
}

Фрагмент с RecyclerView:

package com.starikov.gidtj.TownLists.Dushanbe;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.starikov.gidtj.R;
import com.starikov.gidtj.adapters.FlowRecyclerViewAdapter;
import com.starikov.gidtj.info.Museum;
public class MuseumsOfDushanbe extends Fragment {
    private CharSequence[] museumNames;
    private CharSequence[] museumDescriptions;
    private int[] museumImages;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        RecyclerView formulaRecycler = (RecyclerView) inflater.inflate(R.layout.museums_of_dushanbe, container, false);
        getActivity().setTitle("Музеи Душанбе");
        setInfo(Museum.dushanbe_museums);
        FlowRecyclerViewAdapter adapter = new FlowRecyclerViewAdapter(museumNames, museumDescriptions, museumImages);
        formulaRecycler.setAdapter(adapter);
        LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
        formulaRecycler.setLayoutManager(layoutManager);
        return formulaRecycler;
    }
    private void setInfo(Museum[] museums) {
        museumNames = new CharSequence[museums.length];
        museumDescriptions = new CharSequence[museums.length];
        museumImages = new int[museums.length];
        for(int i = 0; i < museums.length; ++i) {
            museumNames[i] = museums[i].getName();
            museumDescriptions[i] = museums[i].getDescription();
            museumImages[i] = museums[i].getImageID();
        }
    }
}

Прошу помощи, а то уже битый час бьюсь. Если нужно еще кинуть какой нибудь код, скину только скажите. Заранее спасибо!