title: admob and unity / crash
body: <p>Everything is fine in the console, but it crashes on the smartphone when the ad is requested.</p>
  
  <pre><code>InterstitialAd interstitial;
  
  public void RequestInterstitial()
  {
      string adUnitId = "from admob";
      interstitial = new InterstitialAd(adUnitId);
      AdRequest request = new AdRequest.Builder().Build();
      interstitial.LoadAd(request);
  }
  
  public void ShowInterstitial()
  {
      if (interstitial.IsLoaded())
      {
          interstitial.Show();
      }
  }
  
  void Start() 
  {
      string appId = "from admob";
      MobileAds.Initialize(appId);
  }
  </code></pre>