title: getting exception "IllegalStateException: Can not perform this action after onSaveInstanceState"
body: <p>I have a Live Android application, and from market i have received following stack trace and i have no idea why its happening as its not happening in application code but its getting caused by some or the other event from the application (assumption) </p>
  
  <p>I am not using Fragments, still there is a reference of FragmentManager.
  If any body can throw some light on some hidden facts to avoid this type of issue:</p>
  
  <pre><code>java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
  at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1109)
  at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:399)
  at android.app.Activity.onBackPressed(Activity.java:2066)
  at android.app.Activity.onKeyDown(Activity.java:1962)
  at android.view.KeyEvent.dispatch(KeyEvent.java:2482)
  at android.app.Activity.dispatchKeyEvent(Activity.java:2274)
  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1668)
  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
  at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1112)
  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1720)
  at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1258)
  at android.app.Activity.dispatchKeyEvent(Activity.java:2269)
  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1668)
  at android.view.ViewRoot.deliverKeyEventPostIme(ViewRoot.java:2851)
  at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2824)
  at android.view.ViewRoot.handleMessage(ViewRoot.java:2011)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loop(Looper.java:132)
  at android.app.ActivityThread.main(ActivityThread.java:4025)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:491)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
  at dalvik.system.NativeStart.main(Native Method)  
  </code></pre>