iOS 8 Crash in SSWAnimator

[apeman021]

First, congrats for your great job, iOS 9+ working perfectly. It's a shame that in iOS 8 (8.3.0 and 8.4.0) is crashing sometimes, it would be great if you could have a look at it and help us!

Crash details:
SSWAnimator.m line 114
__33-[SSWAnimator animateTransition:]_block_invoke.70.

Crashed: com.apple.main-thread
0 libobjc.A.dylib 0x1972dfbd0 objc_msgSend + 16
1 UIKit 0x18a1953a4 -[UINavigationController navigationTransitionView:didEndTransition:fromView:toView:] + 1168
2 UIKit 0x18a26c5d0 49-[UINavigationController _startCustomTransition:]_block_invoke + 200
3 UIKit 0x18a1eaf64 -[_UIViewControllerTransitionContext completeTransition:] + 132
4 21 Buttons 0x1000b7150 __33-[SSWAnimator animateTransition:]_block_invoke.70 (SSWAnimator.m:114)
5 UIKit 0x18a100708 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 408
6 UIKit 0x18a100270 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 188
7 UIKit 0x18a100178 -[UIViewAnimationState animationDidStop:finished:] + 104
8 QuartzCore 0x189a0962c CA::Layer::run_animation_callbacks(void) + 296
9 libdispatch.dylib 0x197949954 _dispatch_client_callout + 16
10 libdispatch.dylib 0x19794e20c _dispatch_main_queue_callback_4CF + 1608
11 CoreFoundation 0x1856077f8 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE* + 12
12 CoreFoundation 0x1856058a0 __CFRunLoopRun + 1492
13 CoreFoundation 0x1855312d4 CFRunLoopRunSpecific + 396
14 GraphicsServices 0x18ef8f6fc GSEventRunModal + 168
15 UIKit 0x18a12ef40 UIApplicationMain + 1488
16 21 Buttons 0x100232bf8 main (main.m:14)
17 libdyld.dylib 0x197976a08 start + 4

[fastred]

Thank you. Do you have – by any chance – steps to reproduce this crash on devices with iOS 8?