WKWebView Crashed on iOS14

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