title: loadHTMLString warn "Null passed to a callee that requires a non-null argument" IOS9 Obj-C
body: <p>I've just installed xcode 7 with ios 9.1 and I get this warning on a webview:</p>
  
  <blockquote>
    <p>Null passed to a callee that requires a non-null argument</p>
  </blockquote>
  
  <p>This is the code that fires the error:</p>
  
  <pre><code>-(void)viewWillDisappear:(BOOL)animated
  {
      if(exitView)
          [ytView.webView loadHTMLString:nil baseURL:nil];
  }
  </code></pre>
  
  <p>This way when the user goes back the webView (that plays a YT video) stops, it worked fine before, why does it gives this warning now?
  How can I fix it?</p>