I met the same questions, hope workaround . and by the way ,we met another wkwebview's crash On iOS14.0. the crash thread info like below: 1 libobjc.A.dylib objcrootReleaseWasZero (in libobjc.A.dylib) + 72 2 UIKitCore[UIFocusContainerGuideMapEntry setFocusContainmentFrame:] (in UIKitCore) + 16 3 UIKitCore[UIFocusRegionMapEntry mapEntriesByOccludingWithFrame:] (in UIKitCore) + 344 4 UIKitCore[UIFocusRegionMapSnapshot .cxxdestruct] (in UIKitCore) + 96 5 UIKitCore[UIFocusableRegionMapEntry description] (in UIKitCore) + 116 6 UIKitCore[UIFocusableRegionMapEntry description] (in UIKitCore) + 228 7 UIKitCore[UIFocusRegionMapSnapshot visualRepresentationWithMinimumArea:] (in UIKitCore) + 1844 8 UIKitCore[UIFocusRegionMapSnapshot visualRepresentationWithMinimumArea:] (in UIKitCore) + 672 9 UIKitCore[UIFocusRegionMapSnapshot snapshotByFulfillingPromiseFocusRegionEntry:] (in UIKitCore) + 848 10 UIKitCore[UIStateMachine(Legacy) setStaticTransitionFromState:withEvent:toState:] (in UIKitCore) + 128 11 UIKitCore[UIEstimatedTouchRecord initWithLiveTouch:freezeTouch:contextID:] (in UIKitCore) + 4 12 UIKitCore[UIWebDocumentView(Interaction) deepestNodeAtViewportLocation:] (in UIKitCore) + 96 13 WebKit[WKProcessAssertionBackgroundTaskManager updateBackgroundTask] (in WebKit) + 272 14 WebKit bool IPC::MessageSender::send<Messages::WebPaymentCoordinator::DidAuthorizePayment>(Messages::WebPaymentCoordinator::DidAuthorizePayment const&, unsigned long long, WTF::OptionSet<IPC::SendOption>) (in WebKit) + 28 15 WebKit[WKContentView(WKInteractionPreview) presentedViewControllerForPreviewItemController:] (in WebKit) + 1564 16 UIKitCore[UIBezierPath encodeWithCoder:] (in UIKitCore) + 140 17 UIKitCore 21+[UIColor blackColor]blockinvoke (in UIKitCore) + 140 18 UIKitCore[UIDisplayP3Color initWithDisplayP3Red:green:blue:alpha:] (in UIKitCore) + 196 19 UIKitCore[UIDeviceRGBColor set] (in UIKitCore) + 48 20 UIKitCore 83+[UIAppearance applyInvocationsTo:window:matchingSelector:onlySystemInvocations:]blockinvoke (in UIKitCore) + 312 21 UIKitCore[UIAppearance appearancesAtNode:withObject:] (in UIKitCore) + 992 22 UIKitCore _processEventQueue (in UIKitCore) + 8700 23 UIKitCore UIDrawViewRectAfterCommit (in UIKitCore) + 708 24 UIKitCore[UIStatusBarLockView animateUnlockWithCompletionBlock:] (in UIKitCore) + 704 25 UIKitCore[UIStatusBarDualCellularSignalView setTopConstraint:] (in UIKitCore) + 0 26 CoreFoundation[_NSDictionary0 copy] (in CoreFoundation) + 0 27 CoreFoundation copyhelperblocke832o40o48b56o64r (in CoreFoundation) + 16 28 CoreFoundation destroyhelperblocke832o40o48b56r64r (in CoreFoundation) + 16 29 CoreFoundation CFRunLoopTimerSetNextFireDate (in CoreFoundation) + 1072 30 CoreFoundation CFRunLoopTimerCreate (in CoreFoundation) + 384 31 GraphicsServices GSSendEvent (in GraphicsServices) + 252 32 UIKitCore[UISearchControllerATVSearchBarAnimator updateLayoutForGridKeyboard:animated:] (in UIKitCore) + 4092 33 UIKitCore[_UISearchFormSheetPresentationController presentationTransitionWillBegin] (in UIKitCore) + 20 34 JD4iPhone main (in JD4iPhone) (main.m:15) 35 libdyld.dylib 0x00000001802bb3d4 (in libdyld.dylib) Hope Reply from Apple and workaround!!!!!!

I met the same question，and i found it maybe related to the function calling ---- "window.webkit.messageHandlers.CustomName.postMessages", if i deleted those methods, it maybe becomes correct。 it really confused！ sometimes we delete some common JavaScript， it can become correct too! SAD !!!!!

met the same issue, any body can help?