IllegalStateException: Fragment <ThisFragment> is not currently in the FragmentManager

I have trouble of tracing the cause of the crash in my app. I have a fragment that displays a `ListView`, I also have `SlidingMenu` for a search field. And when I search, the `ListView` items are repopulated basing from the search results. Now, my app crashes when I try to open a `ListView` item from the new populated result. The exception is triggered here: ``` @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); getSupportFragmentManager().putFragment(outState, "mContent", mContent); //Exception made here } ``` Is this because of the support library? How do I resolve this? EDIT: Here's the stack trace: ``` 02-05 12:51:53.941: E/AndroidRuntime(11638): FATAL EXCEPTION: main 02-05 12:51:53.941: E/AndroidRuntime(11638): java.lang.IllegalStateException: Fragment MyFragment{436749b0} is not currently in the FragmentManager 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.support.v4.app.FragmentManagerImpl.putFragment(FragmentManager.java:546) 02-05 12:51:53.941: E/AndroidRuntime(11638): at com.sample.android.app.SearchListActivity.onSaveInstanceState(SearchListActivity.java:118) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.Activity.performSaveInstanceState(Activity.java:1137) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.Instrumentation.callActivityOnSaveInstanceState(Instrumentation.java:1215) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:2972) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3031) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.ActivityThread.access$900(ActivityThread.java:138) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.os.Handler.dispatchMessage(Handler.java:99) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.os.Looper.loop(Looper.java:213) 02-05 12:51:53.941: E/AndroidRuntime(11638): at android.app.ActivityThread.main(ActivityThread.java:4787) 02-05 12:51:53.941: E/AndroidRuntime(11638): at java.lang.reflect.Method.invokeNative(Native Method) 02-05 12:51:53.941: E/AndroidRuntime(11638): at java.lang.reflect.Method.invoke(Method.java:511) 02-05 12:51:53.941: E/AndroidRuntime(11638): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 02-05 12:51:53.941: E/AndroidRuntime(11638): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) 02-05 12:51:53.941: E/AndroidRuntime(11638): at dalvik.system.NativeStart.main(Native Method) ``` EDIT 2: Here's my Activity: ``` private Fragment mFragment; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); .......... params = new Bundle(); params.putInt("id", id); // set the Above View Fragment if (savedInstanceState != null) mFragment = getSupportFragmentManager().getFragment( savedInstanceState, "mFragment"); else { FragmentManager fragmentManager = getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager .beginTransaction(); SampleListFragment fragment = new SampleListFragment(); fragment.setArguments(params); fragmentTransaction.add(R.id.list_fragment, fragment); fragmentTransaction.commit(); } if (mFragment == null) { mFragment = new SampleListFragment(); mFragment.setArguments(params); } getSupportFragmentManager().beginTransaction() .replace(R.id.list_fragment, mFragment).commit(); // set the Behind View Fragment Fragment searchFragment = new SampleSearchFragment(); searchFragment.setArguments(params); getSupportFragmentManager().beginTransaction() .replace(R.id.activity_search, searchFragment) .commit(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); getSupportFragmentManager().putFragment(outState, "mFragment", mFragment); } ``` And in my `SampleListFragment`, I have this method: ``` public static boolean isNetworkAvailable(Activity activity) { ConnectivityManager connectivity = (ConnectivityManager) activity .getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity == null) { return false; } else { NetworkInfo[] info = connectivity.getAllNetworkInfo(); if (info != null) { for (int i = 0; i < info.length; i++) { if (info[i].getState() == NetworkInfo.State.CONNECTED) { return true; } } } } return false; } ``` Inside of `Asynctask`: ``` .......... @Override protected void onPostExecute(String result) { super.onPostExecute(null); if (null != pDialog && pDialog.isShowing()) { pDialog.dismiss(); } if (isNetworkAvailable(getActivity())) { //Triggered NPE ``` From here, how do I know if `getActivity()` is now attached to the parent activity before calling it?