Below are parts of similar crash reports with slightly different stack traces:
0 libobjc.A.dylib 0x18c44e838 object_getClass + 48
1 Foundation 0x1930807b4 _NSKeyValueObservationInfoGetObservances + 264
2 Foundation 0x19307fc7c NSKeyValueWillChangeWithPerThreadPendingNotifications + 232
3 QuartzCore 0x19572f14c CAAnimation_setter(CAAnimation*, unsigned int, _CAValueType, void const*) + 128
4 QuartzCore 0x19572f0a4 -[CAPropertyAnimation setKeyPath:] + 52
5 UIKitCore 0x1963e8fc8 -[UIImageView startAnimating] + 684
6 UIKitCore 0x1963e8ce4 -[UIActivityIndicatorView layoutSubviews] + 1128
7 UIKitCore 0x196329c04 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1528
8 QuartzCore 0x19573c7ec CA::Layer::layout_if_needed(CA::Transaction*) + 500
9 QuartzCore 0x19573c374 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 144
10 QuartzCore 0x195742860 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 464
11 QuartzCore 0x19573bb80 CA::Transaction::commit() + 648
12 QuartzCore 0x19573b828 CA::Transaction::flush_as_runloop_observer(bool) + 88
13 CoreFoundation 0x1940ff7bc __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36
14 CoreFoundation 0x1940fe1c4 __CFRunLoopDoObservers + 548
15 CoreFoundation 0x1940fd8e0 __CFRunLoopRun + 1028
16 CoreFoundation 0x1940fd3f8 CFRunLoopRunSpecific + 608
17 GraphicsServices 0x1d768b4f8 GSEventRunModal + 164
18 UIKitCore 0x1965238a0 -[UIApplication _run] + 888
19 UIKitCore 0x196522edc UIApplicationMain + 340
20 MyApp 0x1048431b0 main + 140
21 dyld 0x1b6e52dcc start + 2240
Thread 0 Crashed:
0 libobjc.A.dylib 0x18c44e838 object_getClass + 48
1 Foundation 0x1930807b4 _NSKeyValueObservationInfoGetObservances + 264
2 Foundation 0x19307fc7c NSKeyValueWillChangeWithPerThreadPendingNotifications + 232
3 QuartzCore 0x19572f14c CAAnimation_setter(CAAnimation*, unsigned int, _CAValueType, void const*) + 128
4 QuartzCore 0x195780354 -[CABasicAnimation setFromValue:] + 52
5 QuartzCore 0x195780200 CALayerCreateImplicitAnimation + 276
6 QuartzCore 0x195715f20 -[CALayer actionForKey:] + 420
7 QuartzCore 0x195715c84 CA::Layer::begin_change(CA::Transaction*, unsigned int, objc_object*, objc_object*&) + 204
8 QuartzCore 0x195716984 CA::Layer::setter(unsigned int, _CAValueType, void const*) + 792
9 QuartzCore 0x195716644 -[CALayer setOpacity:] + 56
10 MyApp 0x100972ae4 -[CALayer(Visbility) setSimHidden:] + 200
Thread 0 Crashed:
0 libobjc.A.dylib 0x18c44e838 object_getClass + 48
1 Foundation 0x1930807b4 _NSKeyValueObservationInfoGetObservances + 264
2 Foundation 0x19307fc7c NSKeyValueWillChangeWithPerThreadPendingNotifications + 232
3 QuartzCore 0x19572f14c CAAnimation_setter(CAAnimation*, unsigned int, _CAValueType, void const*) + 128
4 QuartzCore 0x19572f0a4 -[CAPropertyAnimation setKeyPath:] + 52
5 QuartzCore 0x19572f050 +[CAPropertyAnimation animationWithKeyPath:] + 36
6 UIKitCore 0x196448c8c __67-[_UIViewAdditiveAnimationAction runActionForKey:object:arguments:]_block_invoke_2 + 384
7 UIKitCore 0x196448a3c -[_UIViewAdditiveAnimationAction runActionForKey:object:arguments:] + 1968
8 QuartzCore 0x195704dec CA::Layer::set_bounds(CA::Rect const&, bool) + 436
9 QuartzCore 0x195704c0c -[CALayer setBounds:] + 132
10 QuartzCore 0x1957048ac -[CALayer setFrame:] + 416
11 UIKitCore 0x1963102fc -[UIView _backing_setFrame:] + 240
12 UIKitCore 0x19630e7e8 -[UIView(Geometry) setFrame:] + 296
13 UIKitCore 0x19630fa38 -[UIImageView _setViewGeometry:forMetric:] + 160
14 UIKitCore 0x196367104 -[UIButtonLegacyVisualProvider layoutSubviews] + 108
15 UIKitCore 0x196367058 -[UIButton layoutSubviews] + 40
16 UIKitCore 0x196329c04 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1528
17 QuartzCore 0x19573c7ec CA::Layer::layout_if_needed(CA::Transaction*) + 500
18 UIKitCore 0x19632ccb4 -[UIView(Hierarchy) layoutBelowIfNeeded] + 296
19 MyApp 0x10465973c __74-[KKAssetBrowseCollectionViewController willOpenAssetThumbnailCompletion:]_block_invoke + 328