title: React-native-navigation: goBack() doesn't work
body: <p>I use React Navigation with Redux in React Native.
  Navigation is working fine, but on one screen the goBack() function doesn't work. Can you tell we why?</p>
  
  <p>This is the header config:</p>
  
  <pre><code>static navigationOptions = {
          header: ({ state, goBack }) =&gt; {
              return {
                  title: state.params.name,
                  right: (&lt;Button
                      title={'Done'}
                      onPress={() =&gt; goBack()}
                  /&gt;)
  
              }
          }
      }
  </code></pre>
  
  <p>This is the dispatched event:</p>
  
  <p><a href="https://i.stack.imgur.com/F0xCL.png" rel="noreferrer"><img src="https://i.stack.imgur.com/F0xCL.png" alt="enter image description here"></a></p>
  
  <p><strong>No Screen is poped off. The Screen on the device stays the same.</strong></p>