DialogFragment orientation change

I have an activty and two fragments. One of the fragments extends DialogFragment and shows some text.
In my activity i have overriden onCreate method:

@Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(layoutId);
     if (savedInstanceState == null)
         initFragment();
 }
 

initFragment() adds a fragment to a FrameLayout in my layoutId. If no DialogFragment is shown everything works fine, but in case DialogFragment instance is shown - orientation change throws IllegalStateException that fragment did not return View on the line "setContentView".

BTW I'm using ActionBarSherlock

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