title: How to find root cause Crashed: com.apple.main-thread in production app?
body: <p>i have such a report from Crashlytics:</p>
  
  <pre><code>Thread : Crashed: com.apple.main-thread
  0  libobjc.A.dylib                0x000000019503fbd0 objc_msgSend + 16
  1  CoreFoundation                 0x00000001836e5458 CFRelease + 524
  2  CoreFoundation                 0x00000001836f1a18 -[__NSArrayM dealloc] + 152
  3  libobjc.A.dylib                0x0000000195045724 (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 564
  4  CoreFoundation                 0x00000001836e9074 _CFAutoreleasePoolPop + 28
  5  Foundation                     0x000000018461a588 -[NSAutoreleasePool release] + 148
  6  UIKit                          0x00000001882b4460 -[UIApplication _run] + 588
  7  UIKit                          0x00000001882aefac UIApplicationMain + 1488
  </code></pre>
  
  <p>Is there anything I can do to catch such an issue? It happens on customer devices so I have no chance to reproduce it.</p>