Crash when clicking to fast

[ogezue]

I noticed that BCC causes a crash if I click to fast. I could reproduce it in your example app but I can't give you the exact steps. Just click around like a monkey.

2018-07-15 15:52:44.383602+0200 MyApp[89546:15766660] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to delete item 4 from section 0 which only contains 3 items before the update'
*** First throw call stack:
(
0 CoreFoundation 0x00000001044d61e6 __exceptionPreprocess + 294
1 libobjc.A.dylib 0x0000000103b6b031 objc_exception_throw + 48
2 CoreFoundation 0x00000001044db472 +[NSException raise:format:arguments:] + 98
3 Foundation 0x000000010360e652 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 193
4 UIKit 0x0000000105d6bad4 -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:animator:] + 4637
5 UIKit 0x0000000105d7700e -[UICollectionView _endUpdatesWithInvalidationContext:tentativelyForReordering:animator:] + 71
6 UIKit 0x0000000105d77357 -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:animator:] + 439
7 UIKit 0x0000000105d7717d -[UICollectionView _performBatchUpdates:completion:invalidationContext:tentativelyForReordering:] + 91
8 UIKit 0x0000000105d770ff -[UICollectionView _performBatchUpdates:completion:invalidationContext:] + 74
9 UIKit 0x0000000105d77054 -[UICollectionView performBatchUpdates:completion:] + 53
10 MyApp 0x0000000101013be2 _T010MyApp31BreadcrumbsNavigationControllerC6update33_93B9F249E3BD0367AFA0C314644DA50ELLyAC5EventAELLO5event_tF + 546
11 MyApp 0x0000000101014715 T010MyApp31BreadcrumbsNavigationControllerC6update33_93B9F249E3BD0367AFA0C314644DA50ELLyAC5EventAELLO5event_tFySbcfU0 + 357
12 MyApp 0x0000000101017b93 _T010MyApp31BreadcrumbsNavigationControllerC6update33_93B9F249E3BD0367AFA0C314644DA50ELLyAC5EventAELLO5event_tFySbcfU0_TA + 19
13 MyApp 0x0000000101014a49 _T0SbIegy_SbIeyBy_TR + 57
14 UIKit 0x0000000105d76e4d -[UICollectionView _updateAnimationDidStop:finished:context:] + 2174
15 UIKit 0x0000000105d76334 __71-[UICollectionView _updateWithItems:tentativelyForReordering:animator:]_block_invoke_2 + 82
16 UIKit 0x00000001057512b3 __47-[UICollectionViewAnimation startWithAnimator:]_block_invoke.222 + 279
17 UIKit 0x00000001053510ad -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 859
18 UIKit 0x0000000105323ea9 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 343
19 UIKit 0x00000001053244ec -[UIViewAnimationState animationDidStop:finished:] + 293
20 QuartzCore 0x0000000102df25e5 _ZN2CA5Layer23run_animation_callbacksEPv + 323
21 libdispatch.dylib 0x0000000108fe87ec _dispatch_client_callout + 8
22 libdispatch.dylib 0x0000000108ff38cf _dispatch_main_queue_callback_4CF + 628
23 CoreFoundation 0x0000000104498c99 CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 9
24 CoreFoundation 0x000000010445cea6 __CFRunLoopRun + 2342
25 CoreFoundation 0x000000010445c30b CFRunLoopRunSpecific + 635
26 GraphicsServices 0x000000010c4d8a73 GSEventRunModal + 62
27 UIKit 0x000000010528f057 UIApplicationMain + 159
28 MyApp 0x0000000101001097 main + 55
29 libdyld.dylib 0x0000000109065955 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Problem is in this line

if let event = self.events.popLast() {
self.update(event: event)
}

[ogezue]

Thank you!