title: fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)
body: <p>I have a problem with unwrapping and not understand this error:</p>
  
  <pre><code>fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)`. 
  </code></pre>
  
  <p>All that i have found help me not onward. In the first ViewController i have this code  </p>
  
  <pre><code>var everypicture = [EveryPicture] ()
  </code></pre>
  
  <p>and I present the delegate of the first ViewController to the SecondViewController:</p>
  
  <pre><code>var delegate: FirstViewController?` 
  </code></pre>
  
  <p>in the Segue. Then i get the every picture from the delegate and get the count:</p>
  
  <pre><code>let piccount = delegate?.everypicture.count
  print("\(piccount!)")` 
  </code></pre>
  
  <p>but its comes the error. What make I wrong and what does the error mean ? Thanks for help</p>