How to fix java.lang.IllegalStateException in onSaveInstanceState

What could be causing this exception?

E/AndroidRuntime(16901): FATAL EXCEPTION: main
E/AndroidRuntime(16901): Process: com.borqs.karbonn.music, PID: 16901
E/AndroidRuntime(16901): java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
E/AndroidRuntime(16901): at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1323)
E/AndroidRuntime(16901): at android.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1341)
E/AndroidRuntime(16901): at android.app.BackStackRecord.commitInternal(BackStackRecord.java:609)
E/AndroidRuntime(16901): at android.app.BackStackRecord.commit(BackStackRecord.java:587)
E/AndroidRuntime(16901): at com.borqs.music.MusicHubMainActivity.onNavigationItemSelected(MusicHubMainActivity.java:1167)
E/AndroidRuntime(16901): at com.android.internal.widget.ActionBarView$1.onItemSelected(ActionBarView.java:148)
E/AndroidRuntime(16901): at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
E/AndroidRuntime(16901): at android.widget.AdapterView.access$200(AdapterView.java:48)
E/AndroidRuntime(16901): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
E/AndroidRuntime(16901): at android.os.Handler.handleCallback(Handler.java:808)
E/AndroidRuntime(16901): at android.os.Handler.dispatchMessage(Handler.java:103)
E/AndroidRuntime(16901): at android.os.Looper.loop(Looper.java:193)
E/AndroidRuntime(16901): at android.app.ActivityThread.main(ActivityThread.java:5299)
E/AndroidRuntime(16901): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(16901): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime(16901): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
E/AndroidRuntime(16901): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)^M
E/AndroidRuntime(16901): at dalvik.system.NativeStart.main(Native Method)

This is my onSave instance code

@Override
public void onSaveInstanceState(Bundle state)
{
    super.onSaveInstanceState(state);
    saveInstance =true;
    if (state == null)
    {
        FragmentManager mFragmentManager = getFragmentManager();
        FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
        MediaPlaybackFragment fragment = new MediaPlaybackFragment();
        fragmentTransaction.add(R.id.content_frame, fragment);
        fragmentTransaction.commit();
    } else {
        state.putInt("position", mPostion);
        selectedTab = tabHost.getCurrentTab();
        state.putInt("tabhostselected", selectedTab);
        state.putBoolean("isSaveInstance", saveInstance);
        // state.putBoolean("draweropened", mDrawergarment.isDrawerOpened());
    }
}

This is my on navigation code

@Override
public boolean onNavigationItemSelected(int position, long itemId) {
    Fragment newFragment = null;
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction ft = fragmentManager.beginTransaction();
    newFragment = new MediaPlaybackFragment();
    ft.replace(R.id.content_frame, newFragment, "Music");
    ft.commit();
}

Any help would be much appreciated, if you need more information please ask.