In my App,I have met a crash on iOS14(18A5319i), 1000 times one day. Does anyone have ideas? Follow is stack: Thread 0 Crashed: 0 libobjc.A.dylib _objcrootReleaseWasZero (in libobjc.A.dylib) 72 1 UIKitCore -[UIFocusRegionMapEntry mapEntriesByOccludingWithFrame:] (in UIKitCore) 344 2 UIKitCore -[UIFocusRegionMapSnapshot .cxxdestruct] (in UIKitCore) 96 3 UIKitCore -[UIFocusableRegionMapEntry description] (in UIKitCore) 116 4 UIKitCore -[UIFocusableRegionMapEntry description] (in UIKitCore) 228 5 UIKitCore -[UIFocusRegionMapSnapshot visualRepresentationWithMinimumArea:] (in UIKitCore) 1844 6 UIKitCore -[UIFocusRegionMapSnapshot visualRepresentationWithMinimumArea:] (in UIKitCore) 672 7 UIKitCore -[UIFocusRegionMapSnapshot snapshotByFulfillingPromiseFocusRegionEntry:] (in UIKitCore) 848 8 UIKitCore -[UIStateMachine(Legacy) setStaticTransitionFromState:withEvent:toState:] (in UIKitCore) 128 9 UIKitCore -[UIEstimatedTouchRecord initWithLiveTouch:freezeTouch:contextID:] (in UIKitCore) 4 10 UIKitCore -[UIWebDocumentView(Interaction) deepestNodeAtViewportLocation:] (in UIKitCore) 96 11 WebKit -[WKProcessAssertionBackgroundTaskManager updateBackgroundTask] (in WebKit) 272 12 WebKit bool IPC::MessageSender::send<Messages::WebPaymentCoordinator::DidAuthorizePayment>(Messages::WebPaymentCoordinator::DidAuthorizePayment const&, unsigned long long, ***::OptionSet<IPC::SendOption>) (in WebKit) 28 13 WebKit -[WKContentView(WKInteractionPreview) presentedViewControllerForPreviewItemController:] (in WebKit) 1564 14 UIKitCore -[UIBezierPath encodeWithCoder:] (in UIKitCore) 140 15 UIKitCore __21+[UIColor blackColor]blockinvoke (in UIKitCore) 140 16 UIKitCore -[UIDisplayP3Color initWithDisplayP3Red:green:blue:alpha:] (in UIKitCore) 196 17 UIKitCore -[UIDeviceRGBColor set] (in UIKitCore) 48 18 UIKitCore _83+[UIAppearance applyInvocationsTo:window:matchingSelector:onlySystemInvocations:]blockinvoke (in UIKitCore) 312 19 UIKitCore +[UIAppearance appearancesAtNode:withObject:] (in UIKitCore) 992 20 UIKitCore __processEventQueue (in UIKitCore) 8700 21 UIKitCore UIDrawViewRectAfterCommit (in UIKitCore) 708 22 UIKitCore -[UIStatusBarLockView animateUnlockWithCompletionBlock:] (in UIKitCore) 704 23 UIKitCore -[UIStatusBarDualCellularSignalView setTopConstraint:] (in UIKitCore) 0 24 CoreFoundation -[NSDictionary0 copy] (in CoreFoundation) 0 25 CoreFoundation _copyhelperblocke832o40o48b56o64r (in CoreFoundation) 16 26 CoreFoundation _destroyhelperblocke832o40o48b56r64r (in CoreFoundation) 16 27 CoreFoundation CFRunLoopTimerSetNextFireDate (in CoreFoundation) 1072 28 CoreFoundation CFRunLoopTimerCreate (in CoreFoundation) 384 29 GraphicsServices GSSendEvent (in GraphicsServices) 252 30 UIKitCore -[UISearchControllerATVSearchBarAnimator updateLayoutForGridKeyboard:animated:] (in UIKitCore) 4092 31 UIKitCore -[UISearchFormSheetPresentationController presentationTransitionWillBegin] (in UIKitCore) 20