title: NSInteralInconsistencyException - UIKeyboardLayoutAlignmentView
body: <p>I am getting the follow crash in my reports but I don't have a clue as to where to start looking! - any help appreciated.  I have no calls or reference to UIKeyboardLayoutAlignmentView</p>
  
  <pre><code>        Fatal Exception: NSInternalInconsistencyException
          The layout constraints still need update after sending -updateConstraints
          to &lt;_UIKeyboardLayoutAlignmentView: 0x14df2550; frame = (0 0; 0 0);
      userInteractionEnabled = NO; layer = &lt;CALayer: 0x1603de90&gt;&gt;.
   _UIKeyboardLayoutAlignmentView or one of its superclasses may
          have overridden -updateConstraints without calling super. 
          Or, something may have dirtied layout constraints in the middle
          of updating them. Both are programming errors.
  Thread : Crashed: com.apple.main-thread
  0  libsystem_kernel.dylib         0x32d52df0 __pthread_kill + 8
  1  libsystem_pthread.dylib        0x32dd1cc7 pthread_kill + 62
  2  libsystem_c.dylib              0x32cee909 abort + 76
  3  libc++abi.dylib                0x3201c9c9 __cxa_bad_cast
  4  libc++abi.dylib                0x32036671 default_unexpected_handler()
  5  libobjc.A.dylib                0x326fcf25 _objc_terminate() + 192
  6  libc++abi.dylib                0x32033de3 std::__terminate(void (*)()) + 78
  7  libc++abi.dylib                0x320338af __cxa_rethrow + 102
  8  libobjc.A.dylib                0x326fcdd3 objc_exception_rethrow + 42
  9  CoreFoundation                 0x240bf29d CFRunLoopRunSpecific + 632
  10 CoreFoundation                 0x240bf013 CFRunLoopRunInMode + 106
  11 GraphicsServices               0x2b99e201 GSEventRunModal + 136
  12 UIKit                          0x27863a59 UIApplicationMain + 1440
  
  
  Thread : Fatal Exception: NSInternalInconsistencyException
  0  CoreFoundation                 0x241aefef __exceptionPreprocess + 126
  1  libobjc.A.dylib                0x326fcc8b objc_exception_throw + 38
  2  CoreFoundation                 0x241aef35 -[NSException initWithCoder:]
  3  UIKit                          0x27e34dad -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPassAndViewsNeedingBaselineUpdate:] + 448
  4  UIKit                          0x27e34ec3 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPassAndViewsNeedingBaselineUpdate:] + 126
  5  CoreFoundation                 0x240bec6d CFArrayApplyFunction + 36
  6  UIKit                          0x27e34c75 -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPassAndViewsNeedingBaselineUpdate:] + 136
  7  UIKit                          0x27e34ec3 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPassAndViewsNeedingBaselineUpdate:] + 126
  8  CoreFoundation                 0x240bec6d CFArrayApplyFunction + 36
  9  UIKit                          0x27e34c75 -[UIView(AdditionalLayoutSupport) _internalUpdateConstraintsIfNeededAccumulatingViewsNeedingSecondPassAndViewsNeedingBaselineUpdate:] + 136
  10 UIKit                          0x27e34ec3 -[UIView(AdditionalLayoutSupport) _updateConstraintsIfNeededAccumulatingViewsNeedingSecondPassAndViewsNeedingBaselineUpdate:] + 126
  11 UIKit                          0x278f0a39 __60-[UIView(AdditionalLayoutSupport) updateConstraintsIfNeeded]_block_invoke + 84
  12 Foundation                     0x24e65755 -[NSISEngine withBehaviors:performModifications:] + 256
  13 UIKit                          0x278f0813 -[UIView(AdditionalLayoutSupport) updateConstraintsIfNeeded] + 206
  14 UIKit                          0x2790a663 -[UIWindow(UIConstraintBasedLayout) updateConstraintsIfNeeded] + 86
  15 UIKit                          0x27e35159 -[UIView(AdditionalLayoutSupport) _updateConstraintsAtEngineLevelIfNeeded] + 172
  16 UIKit                          0x27813d97 -[UIView(Hierarchy) layoutBelowIfNeeded] + 542
  17 UIKit                          0x27c77a2b -[_UIAlertControllerAnimatedTransitioning animateTransition:] + 690
  18 UIKit                          0x27adb08d __56-[UIPresentationController runTransitionForCurrentState]_block_invoke + 1820
  19 UIKit                          0x2787ea91 _applyBlockToCFArrayCopiedToStack + 308
  20 UIKit                          0x277f938f _afterCACommitHandler + 466
  21 CoreFoundation                 0x24174fed __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 20
  22 CoreFoundation                 0x241726ab __CFRunLoopDoObservers + 278
  23 CoreFoundation                 0x24172ab3 __CFRunLoopRun + 914
  24 CoreFoundation                 0x240bf201 CFRunLoopRunSpecific + 476
  25 CoreFoundation                 0x240bf013 CFRunLoopRunInMode + 106
  26 GraphicsServices               0x2b99e201 GSEventRunModal + 136
  27 UIKit                          0x27863a59 UIApplicationMain + 1440
  </code></pre>