I've got Cell should never be in update animation crash in UICollectionView reported by crashlytics This crash happens only for users on iOS 14. It wasn't noticeable when application used SDK iOS 13 (it affected less then 0.01 % of all users). But after supporting SDK iOS 14 crash frequency noticeably increased to almost 0.25 % of all users Internally UICollectionView, as far as I understand (from some UIKit disassembly journey), loops through visible cells and checks that cell animation counter is equal zero (else it crashes with the following stack trace). It's not for sure but presumably crash happens while performBatchUpdates(_:completion:) I wasn't able to reproduce this bug and I can't spend more time on digging into UIKitCore disassembled code trying to understand when and why this animation counter changes Fatal Exception: NSInternalInconsistencyException 0	CoreFoundation								 0x1915e9114 __exceptionPreprocess 1	libobjc.A.dylib								0x1a4e0fcb4 objc_exception_throw 2	CoreFoundation								 0x1914f8308 -[CFPrefsSearchListSource addManagedSourceForIdentifier:user:] 3	Foundation										 0x1927dc2c8 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] 4	UIKitCore											0x1935b8548 __43-[UICollectionView _updateVisibleCellsNow:]_block_invoke_4.1070 5	UIKitCore											0x1935b8000 __43-[UICollectionView _updateVisibleCellsNow:]_block_invoke.1053 6	libdispatch.dylib							0x191221298 _dispatch_call_block_and_release 7	libdispatch.dylib							0x191222280 _dispatch_client_callout 8	libdispatch.dylib							0x1911d123c _dispatch_main_queue_callback_4CF$VARIANT$mp 9	CoreFoundation								 0x191568c30 CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE 10 CoreFoundation								 0x1915630e8 __CFRunLoopRun 11 CoreFoundation								 0x191562200 CFRunLoopRunSpecific 12 GraphicsServices							 0x1a765d598 GSEventRunModal 13 UIKitCore											0x193e28004 -[UIApplication _run] 14 UIKitCore											0x193e2d5d8 UIApplicationMain 15 Joom													 0x100dd2d1c main + 49 (main.m:49) 16 libdyld.dylib									0x191241598 start Did anyone faced with the same issue? Were you able to reproduce it?