title: How to reproduce and fix the cause of the crash on ios 9?
body: <p>Application is crashes on iPad mini 2 Retina iOS 9.0.2.
  I have crash information from the TestFlight External Tester, but I can not reproduce the error and can not find the line of code with an error.
  Please help me to solve this problem. </p>
  
  <p>Thanks.</p>
  
  <p><a href="https://i.stack.imgur.com/eWm8H.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eWm8H.png" alt="Crash information from TestFlight"></a></p>
  
  <p><a href="https://i.stack.imgur.com/wU9hv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wU9hv.png" alt="enter image description here"></a></p>