UE4 Crashes in FVoiceModule

Development Programming & Scripting
1

Hello!
I’m now using a microphone via FVoiceModule.
All works fine in 4.10, but after upgrade to 4.11, i’ve got a crash in “VoiceModuleWindows.cpp” in “CaptureDeviceCallback” function.

Exception thrown: read access violation.
lpGuid was nullptr.

UE4 crashes on this function:

voiceCapture = FVoiceModule::Get().CreateVoiceCapture();

There is my CallStack from Visual Studio 2015

	UE4Editor-Voice.dll!CaptureDeviceCallback(_GUID * lpGuid, const char * lpcstrDescription, const char * lpcstrModule, void * lpContext) Line 50	C++
 	[External Code]	
 	UE4Editor-Voice.dll!FVoiceCaptureDeviceWindows::Init() Line 277	C++
 	UE4Editor-Voice.dll!FVoiceCaptureDeviceWindows::Create() Line 74	C++
 	UE4Editor-Voice.dll!FVoiceModule::StartupModule() Line 38	C++
 	UE4Editor-Core.dll!FModuleManager::LoadModuleWithFailureReason(const FName InModuleName, EModuleLoadResult & OutFailureReason, const bool bWasReloaded) Line 446	C++
 	UE4Editor-Core.dll!FModuleManager::LoadModule(const FName InModuleName, const bool bWasReloaded) Line 299	C++
 	UE4Editor-WebCameraEncode.dll!FModuleManager::LoadModuleChecked<FVoiceModule>(const FName ModuleName) Line 281	C++
 	UE4Editor-WebCameraEncode.dll!AMyWebCamera::BeginPlay() Line 84	C++
 	UE4Editor-Engine.dll!AWorldSettings::NotifyBeginPlay() Line 148	C++
 	UE4Editor-Engine.dll!AGameMode::HandleMatchHasStarted() Line 623	C++
 	UE4Editor-Engine.dll!AGameMode::SetMatchState(FName NewState) Line 739	C++
 	UE4Editor-Engine.dll!AGameMode::StartMatch() Line 600	C++
 	UE4Editor-Engine.dll!UWorld::BeginPlay() Line 3159	C++
 	UE4Editor-Engine.dll!UGameInstance::StartPIEGameInstance(ULocalPlayer * LocalPlayer, bool bInSimulateInEditor, bool bAnyBlueprintErrors, bool bStartInSpectatorMode) Line 285	C++
 	UE4Editor-UnrealEd.dll!UEditorEngine::CreatePIEGameInstance(int PIEInstance, bool bInSimulateInEditor, bool bAnyBlueprintErrors, bool bStartInSpectatorMode, bool bRunAsDedicated, float PIEStartTime) Line 3078	C++
 	UE4Editor-UnrealEd.dll!UEditorEngine::PlayInEditor(UWorld * InWorld, bool bInSimulateInEditor) Line 2326	C++
 	UE4Editor-UnrealEd.dll!UEditorEngine::StartQueuedPlayMapRequest() Line 1101	C++
 	UE4Editor-UnrealEd.dll!UEditorEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 1251	C++
 	UE4Editor-UnrealEd.dll!UUnrealEdEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 370	C++
 	UE4Editor.exe!FEngineLoop::Tick() Line 2643	C++
 	UE4Editor.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 142	C++
 	UE4Editor.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow) Line 189	C++

Please help!

Update 1
In 4.11.0 all works fine, but 4.11.1 crashes.

2

I get a similar/related error “Exception thrown: read access violation. lpGuid was nullptr.”

#if PLATFORM_SUPPORTS_VOICE_CAPTURE
	if (bEnabled)
	{
		if (!InitVoiceCapture())
		{
			UE_LOG(LogVoice, Warning, TEXT("Failed to initialize voice capture module"));
			ShutdownVoiceCapture();
		}
	}
#endif
}

Error is being thrown in VoiceModule.cpp in line 38 → “if (!InitVoiceCapture())”

3

At this moment in version 4.11.2 the problem was solved, all works fine.
Many thanks, Epic Games!