title: application closes after closing interstitial ad
body: <p>According to the doc: <a href="https://developers.google.com/mobile-ads-sdk/docs/admob/advanced" rel="nofollow">https://developers.google.com/mobile-ads-sdk/docs/admob/advanced</a></p>
  
  <p>I am requesting from activity,</p>
  
  <pre><code>interstitial.loadAd(adRequest);
  interstitial.setAdListener(this);
  </code></pre>
  
  <p>And show the interstitial when it is received in the callback</p>
  
  <pre><code> @Override
    public void onReceiveAd(Ad ad) {
      Log.d("OK", "Received ad");
      if (ad == interstitial) {
        interstitial.show();
      }
    }
  </code></pre>
  
  <p>But I've got a lot of comments, about when advert is closing by user, application closes and they must start it over. I'm not using <code>finish()</code> in <code>onResume</code> or <code>onStop</code> only in <code>onBackPressed</code>. Moreover Im using Facebook SDK in this acitivity and there is <code>onActivityResult</code>. When I testing my app on Motorola RAZR and Nexus 7 everything is ok. </p>