23423423423423333: iOS 13.2 crashes when speaking with AVSpeechSynthesizer

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Description

When calling AVSpeechSynthesizer.speak(string:) the app crashes. This is only occurring on iOS 13.2. Stack trace:

2019-10-07 13:15:43.631368-0700 SpeakExample[52041:5057604] Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <AXSpeechManager 0x600003b78fc0> for the key path "audioSessionCategory" from <AXSpeechManager 0x600003b78fc0> because it is not registered as an observer.' First throw call stack: ( 0 CoreFoundation 0x00007fff23bef05e exceptionPreprocess + 350 1 libobjc.A.dylib 0x00007fff50cb6b20 objc_exception_throw + 48 2 Foundation 0x00007fff25707751 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 601 3 Foundation 0x00007fff25707b5f -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 74 4 Foundation 0x00007fff25707a8c -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:context:] + 177 5 libAXSpeechManager.dylib 0x00007fff4e495366 -[AXSpeechManager handleAudioSessionObservers:] + 139 6 libAXSpeechManager.dylib 0x00007fff4e494c68 -[AXSpeechManager _updateAuxiliarySession:] + 37 7 libAXSpeechManager.dylib 0x00007fff4e494c0d -[AXSpeechManager _activeAudioRouteChanged:] + 135 8 libAXSpeechManager.dylib 0x00007fff4e494b4d -[AXSpeechManager init] + 476 9 AXSpeechImplementation 0x0000000104c8c7ac -[AVSpeechSynthesizer(Implementation) prepareSpeechManager] + 59 10 AXSpeechImplementation 0x0000000104c8c740 -[AVSpeechSynthesizer(Implementation) init] + 76 11 SpeakExample 0x00000001026392f3 $sSo19AVSpeechSynthesizerCABycfcTO + 19 12 SpeakExample 0x0000000102638c3f $sSo19AVSpeechSynthesizerCABycfC + 31 13 SpeakExample 0x0000000102638b00 $s12SpeakExample14ViewControllerC14viewWillAppearyySbF + 160 14 SpeakExample 0x0000000102638d1c $s12SpeakExample14ViewControllerC14viewWillAppearyySbFTo + 60 15 UIKitCore 0x00007fff47333ded -[UIViewController _setViewAppearState:isAnimating:] + 661 16 UIKitCore 0x00007fff47334509 -[UIViewController viewWillAppear:] + 115 17 UIKitCore 0x00007fff4723ed5e 56-[UIPresentationController runTransitionForCurrentState]_block_invoke.465 + 1280 18 UIKitCore 0x00007fff47244bf6 +[UIPresentationController _scheduleTransition:] + 79 19 UIKitCore 0x00007fff4723e5f6 -[UIPresentationController runTransitionForCurrentState] + 1716 20 UIKitCore 0x00007fff4723b72a -[UIPresentationController _presentWithAnimationController:interactionController:target:didEndSelector:] + 1060 21 UIKitCore 0x00007fff479ddb62 -[UIWindow addRootViewControllerViewIfPossible] + 391 22 UIKitCore 0x00007fff479dd128 -[UIWindow _updateLayerOrderingAndSetLayerHidden:actionBlock:] + 232 23 UIKitCore 0x00007fff479de1e5 -[UIWindow _setHidden:forced:] + 362 24 UIKit 0x0000000104896a6a -[UIWindowAccessibility _orderFrontWithoutMakingKey] + 84 25 UIKitCore 0x00007fff479f1591 -[UIWindow _mainQueue_makeKeyAndVisible] + 42 26 UIKitCore 0x00007fff47bf92b1 -[UIWindowScene _makeKeyAndVisibleIfNeeded] + 202 27 UIKitCore 0x00007fff46f37f47 +[UIScene _sceneForFBSScene:create:withSession:connectionOptions:] + 1405 28 UIKitCore 0x00007fff479a283e -[UIApplication _connectUISceneFromFBSScene:transitionContext:] + 1018 29 UIKitCore 0x00007fff479a2b80 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 304 30 UIKitCore 0x00007fff47512369 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 361 31 FrontBoardServices 0x00007fff3677d3c5 -[FBSSceneImpl _callOutQueue_agent_didCreateWithTransitionContext:completion:] + 442 32 FrontBoardServices 0x00007fff367a365c 86-[FBSWorkspaceScenesClient sceneID:createWithParameters:transitionContext:completion:]_block_invoke.154 + 102 33 FrontBoardServices 0x00007fff36787ea5 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 220 34 FrontBoardServices 0x00007fff367a32ed 86-[FBSWorkspaceScenesClient sceneID:createWithParameters:transitionContext:completion:]_block_invoke + 355 35 libdispatch.dylib 0x0000000102960d60 _dispatch_client_callout + 8 36 libdispatch.dylib 0x0000000102963cd1 _dispatch_block_invoke_direct + 300 37 FrontBoardServices 0x00007fff367c9502 FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30 38 FrontBoardServices 0x00007fff367c91f0 -[FBSSerialQueue _queue_performNextIfPossible] + 441 39 FrontBoardServices 0x00007fff367c96ff -[FBSSerialQueue _performNextFromRunLoopSource] + 22 40 CoreFoundation 0x00007fff23b52101 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 41 CoreFoundation 0x00007fff23b5202c CFRunLoopDoSource0 + 76 42 CoreFoundation 0x00007fff23b5185c CFRunLoopDoSources0 + 268 43 CoreFoundation 0x00007fff23b4c50f __CFRunLoopRun + 1263 44 CoreFoundation 0x00007fff23b4bcf6 CFRunLoopRunSpecific + 438 45 GraphicsServices 0x00007fff38655bb0 GSEventRunModal + 65 46 UIKitCore 0x00007fff479a646c UIApplicationMain + 1621 47 SpeakExample 0x0000000102639bab main + 75 48 libdyld.dylib 0x00007fff51b3cc39 start + 1 49 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

To reproduce:

Create a new project with Xcode 11.2 and iOS 13.2:

1. Import AVFoundation
2. Run the following code:

let synth = AVSpeechSynthesizer() let utterance = AVSpeechUtterance(string: "hello") synth.speak(utterance)

- Product Version: iOS Created: 2019-10-07T20:25:38.295690 Originated: 2019-10-02T00:00:00 Open Radar Link: http://www.openradar.me/23423423423423333

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Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081

[openradar-mirror]

Resolved: True Modified: 2019-10-10T18:30:30.649081