Random crashes when trying to server travel from a multiplayer lobby.

Me4tb4llm4rin4r4 · January 28, 2026, 12:52am

My game starts in a main menu where the player can choose to host or join a session (As well as singleplayer). When you choose to host, It brings you into a fortnite type lobby, where you invite your friends via Steam, choose a level, ready up, and load in. Once the players load in, you see the map for a brief second before it crashing with a “Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff“ crash note. I have been trying to figure this out for hours with no results. I am new to multiplayer, and some help would take me a long way.

EDIT: I forgot to mention that I also get a “NetDriverListenFailure“ upon joining the level.

EDIT (Again): I did some messing around and firgured out that it was my VOIP messing things up. When leaving/traveling, the audio doesn’t unload properly. How do I fix this?

King_Zero · January 29, 2026, 10:38am

Could you post a callstack of the crash?

Me4tb4llm4rin4r4 · January 31, 2026, 5:50pm

This?

[2026.01.31-17.48.38:283][617]LogStats: FPlatformStackWalk::StackWalkAndDump - 0.006 s
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: === Handled ensure: ===
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error:
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: Ensure condition failed: !ActorComponent->IsRegistered() || ActorComponent->GetScene() != this [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\RendererScene.cpp] [Line: 4234]
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: Component Name: AudioComponent /Engine/Transient.VoipListenerSynthComponent_2147482154:AudioComponent_2147482153 World Name: World None.None Component Asset: /Engine/Transient.SynthSound_2147482152
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: Stack:
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aef07096 Slop.exe!TSparseArray<TSparseSetElement<TTuple<FLumenSceneDataKey,FLumenSceneData * __ptr64> >,TSparseArrayAllocator<TSizedDefaultAllocator<32>,FDefaultBitArrayAllocator> >::TRangedForIterator::operator!='::2’::<lambda_1>::operator()()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a70f3196 Slop.exe!FScene::Release()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aa691aef Slop.exe!UWorld::FinishDestroy()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a3d95d3b Slop.exe!UObject::ConditionalFinishDestroy()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a3d0ab3f Slop.exe!UE::GC::TDebugReachabilityProcessor<13>::HandleTokenStreamObjectReference()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a3d0b975 Slop.exe!IncrementalPurgeGarbage()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a3c9d98c Slop.exe!UE::GC::PostCollectGarbageImpl<1>()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a3d0ff3d Slop.exe!UE::GC::FReachabilityAnalysisState::PerformReachabilityAnalysisAndConditionallyPurgeGarbage()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a3ccce2b Slop.exe!CollectGarbage()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aa6c8108 Slop.exe!FSeamlessTravelHandler::Tick()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aa8283c6 Slop.exe!UEngine::TickWorldTravel()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6a98ba83e Slop.exe!UGameEngine::Tick()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aaa432bd Slop.exe!FEngineLoop::Tick()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aaa510dd Slop.exe!GuardedMain()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aaa511ca Slop.exe!GuardedMainWrapper()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aaa53dda Slop.exe!LaunchWindowsStartup()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aaa5fbe4 Slop.exe!WinMain()
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ff6aece47aa Slop.exe!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ffb8f3fe8d7 KERNEL32.DLL!UnknownFunction
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error: [Callstack] 0x00007ffb8f72c53c ntdll.dll!UnknownFunction
[2026.01.31-17.48.38:283][617]LogOutputDevice: Error:
[2026.01.31-17.48.38:290][617]LogStats: SubmitErrorReport - 0.000 s
[2026.01.31-17.48.38:510][617]LogWindows: Could not start crash report client using ../../../Engine/Binaries/Win64/CrashReportClient-Win64-Debug.exe
[2026.01.31-17.48.38:510][617]LogMemory: Platform Memory Stats for Windows
[2026.01.31-17.48.38:510][617]LogMemory: Process Physical Memory: 1932.58 MB used, 1939.07 MB peak
[2026.01.31-17.48.38:510][617]LogMemory: Process Virtual Memory: 3033.58 MB used, 3034.54 MB peak
[2026.01.31-17.48.38:510][617]LogMemory: Physical Memory: 24277.52 MB used, 8255.19 MB free, 32532.71 MB total
[2026.01.31-17.48.38:510][617]LogMemory: Virtual Memory: 64810.14 MB used, 4443.20 MB free, 69253.34 MB total
[2026.01.31-17.48.38:510][617]LogStats: SendNewReport - 0.220 s
[2026.01.31-17.48.38:510][617]LogStats: FDebug::EnsureFailed - 0.233 s
[2026.01.31-17.48.38:511][617]LogRenderer: Forcing update for all mesh draw commands: SkyLight real-time capture change
[2026.01.31-17.48.38:512][617]LogUObjectHash: Compacting FUObjectHashTables data took 0.73ms
[2026.01.31-17.48.38:514][617]LogChaosDD: Creating Chaos Debug Draw Scene for world TransitionMap
[2026.01.31-17.48.38:516][617]LogStats: SeamlessTravel FlushLevelStreaming - 0.000 s
[2026.01.31-17.48.38:516][617]LogWorld: Bringing World /Game/_main/Maps/TransitionMap.TransitionMap up for play (max tick rate 0) at 2026.01.31-12.48.38
[2026.01.31-17.48.38:516][617]LogWorld: Bringing up level for play took: 0.000250
[2026.01.31-17.48.38:516][617]LogWorld: Sending NotifyLoadedWorld for LP: LocalPlayer_2147482493 PC: BP_LobbyPC_C_2147482286
[2026.01.31-17.48.38:516][617]LogNet: Verbose: NotifyLoadedWorld Begin
[2026.01.31-17.48.38:517][617]LogNet: VeryVerbose: GetFunctionCallspace Server calling Server function: ServerNotifyLoadedWorld Local
[2026.01.31-17.48.38:517][617]LogNet: Verbose: NotifyLoadedWorld End
[2026.01.31-17.48.38:517][617]LogWorld: StartLoadingDestination to: /Game/_main/Maps/OpenWorldTEST
[2026.01.31-17.48.38:532][618]LogVoiceEngine: OSS: ReadLocalVoiceData: GetVoice: Result: Ok, Available: 1171, LastCall: 896.386 ms
[2026.01.31-17.48.38:532][618]LogOnlineVoice: OSS: Trigger Local 0 NOTTALKING
[2026.01.31-17.48.38:544][621]LogWorld: BeginTearingDown for /Game/_main/Maps/TransitionMap
[2026.01.31-17.48.38:544][621]LogWorld: UWorld::CleanupWorld for TransitionMap, bSessionEnded=true, bCleanupResources=true
[2026.01.31-17.48.38:544][621]LogSlate: InvalidateAllWidgets triggered. All widgets were invalidated
[2026.01.31-17.48.38:577][621]LogAudio: Display: Audio Device (ID: 1) registered with world ‘OpenWorldTEST’.
[2026.01.31-17.48.38:591][621]LogAudio: Display: Audio Device unregistered from world ‘None’.
[2026.01.31-17.48.38:592][621]LogUObjectHash: Compacting FUObjectHashTables data took 1.01ms
[2026.01.31-17.48.38:595][621]LogChaosDD: Creating Chaos Debug Draw Scene for world OpenWorldTEST
[2026.01.31-17.48.38:597][621]LogWorldPartition: ULevel::OnLevelLoaded(OpenWorldTEST)(bIsOwningWorldGameWorld=1, bIsOwningWorldPartitioned=1, InitializeForMainWorld=1, InitializeForEditor=0, InitializeForGame=1)
[2026.01.31-17.48.38:597][621]LogWorldPartition: Display: WorldPartition initialize started…
[2026.01.31-17.48.38:598][621]LogWorldPartition: UWorldPartition::Initialize : World = /Game/_main/Maps/OpenWorldTEST.OpenWorldTEST, World Type = Game, IsMainWorldPartition = 1, Location = V(0), Rotation = R(0), IsEditor = 0, IsGame = 1, IsPIEWorldTravel = 0, IsCooking = 0
[2026.01.31-17.48.38:598][621]LogWorldPartition: UWorldPartition::Initialize Context : World NetMode = Listen Server, IsServer = 1, IsDedicatedServer = 0, IsServerStreamingEnabled = 0, IsServerStreamingOutEnabled = 0, IsUsingMakingVisibleTransaction = 0, IsUsingMakingInvisibleTransaction = 0
[2026.01.31-17.48.38:598][621]LogWorldPartition: Display: WorldPartition initialize took 400 us
[2026.01.31-17.48.38:598][621]LogStreaming: Display: FlushAsyncLoading(68): 1 QueuedPackages, 0 AsyncPackages
[2026.01.31-17.48.38:600][621]LogLoad: Game class is ‘BP_ThirdPersonGameMode_C’
[2026.01.31-17.48.38:600][621]LogStats: SeamlessTravel FlushLevelStreaming - 0.000 s
[2026.01.31-17.48.38:600][621]LogWorld: Bringing World /Game/_main/Maps/OpenWorldTEST.OpenWorldTEST up for play (max tick rate 0) at 2026.01.31-12.48.38
[2026.01.31-17.48.38:600][621]LogWorld: Bringing up level for play took: 0.000909
[2026.01.31-17.48.38:600][621]LogWorld: Sending NotifyLoadedWorld for LP: LocalPlayer_2147482493 PC: BP_LobbyPC_C_2147482286
[2026.01.31-17.48.38:600][621]LogNet: Verbose: NotifyLoadedWorld Begin
[2026.01.31-17.48.38:600][621]LogNet: VeryVerbose: GetFunctionCallspace Server calling Server function: ServerNotifyLoadedWorld Local
[2026.01.31-17.48.38:600][621]LogNet: Verbose: NotifyLoadedWorld End
[2026.01.31-17.48.38:600][621]LogWorld: ----SeamlessTravel finished in 0.97 seconds ------
[2026.01.31-17.48.38:608][621]LogOnlineVoice: OSS: StopLocalVoiceProcessing(0) returned 0x00000000
[2026.01.31-17.48.38:608][621]LogOnlineVoice: OSS: Stopping networked voice for user: 0
[2026.01.31-17.48.38:611][621]voice.MicNoiseGateThreshold = “-1”
[2026.01.31-17.48.38:611][621]voice.SilenceDetectionThreshold = “-1”
[2026.01.31-17.48.38:611][621]voice.MicInputGain = “4”
[2026.01.31-17.48.38:611][621]LogOnlineVoice: OSS: Removing all remote talkers
[2026.01.31-17.48.38:611][621]LogConsoleManager: Warning: Setting the console variable ‘voice.SilenceDetectionThreshold’ with ‘SetByGameSetting’ was ignored as it is lower priority than the previous ‘SetByConsole’. Value remains ‘-1’
[2026.01.31-17.48.38:633][621]LogRHI: Display: Encountered a new graphics PSO: 544306623
[2026.01.31-17.48.38:633][621]LogRHI: Display: Encountered a new compute PSO: 1169135898
[2026.01.31-17.48.38:645][621]LogRHI: Display: Encountered a new graphics PSO: 2134866024
[2026.01.31-17.48.38:735][621]LogViewport: Display: Viewport MouseLockMode Changed, DoNotLock → LockOnCapture
[2026.01.31-17.48.38:735][621]LogViewport: Display: Viewport MouseCaptureMode Changed, CaptureDuringMouseDown → CapturePermanently
[2026.01.31-17.48.38:741][621]LogRenderer: Forcing update for all mesh draw commands: SkyLight real-time capture change
[2026.01.31-17.48.40:852][622]LogOnline: VeryVerbose: OSS: FOnlineAsyncTaskManager::AddToInQueue [FOnlineFriendsSteam::ReadFriendsList() async task completed successfully]
[2026.01.31-17.48.40:852][622]LogWindows: Could not start crash report client using ../../../Engine/Binaries/Win64/CrashReportClient-Win64-Debug.exe
[2026.01.31-17.48.40:852][622]LogMemory: Platform Memory Stats for Windows
[2026.01.31-17.48.40:852][622]LogMemory: Process Physical Memory: 1971.49 MB used, 1971.98 MB peak
[2026.01.31-17.48.40:852][622]LogMemory: Process Virtual Memory: 3076.14 MB used, 3137.41 MB peak
[2026.01.31-17.48.40:852][622]LogMemory: Physical Memory: 24301.83 MB used, 8230.88 MB free, 32532.71 MB total
[2026.01.31-17.48.40:852][622]LogMemory: Virtual Memory: 64845.88 MB used, 4407.47 MB free, 69253.34 MB total
[2026.01.31-17.48.40:852][622]Message dialog closed, result: Ok, title: The UE-Slop Game has crashed and will close, text:
[2026.01.31-17.48.40:852][622]LogThreadingWindows: Error: Runnable thread Background Worker #6 crashed.
[2026.01.31-17.48.40:852][622]LogWindows: Error: === Critical error: ===
[2026.01.31-17.48.40:853][622]LogWindows: Error:
[2026.01.31-17.48.40:853][622]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff
[2026.01.31-17.48.40:853][622]LogWindows: Error:
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a930fdf2 Slop.exe!FAudioDevice::StopSoundsUsingResource()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a93352c3 Slop.exe!FAudioEventLogFields::Initialize'::2’::<lambda_1>::operator()()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a93331f0 Slop.exe!FAudioAsyncBatcher::Flush'::2’::<lambda_1>::operator()()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a934b455 Slop.exe!UE::Tasks::Private::TExecutableTaskBase<FAudioAsyncBatcher::Flush'::2’::<lambda_1>,void,void>::ExecuteTask()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a31571e4 Slop.exe!UE::Tasks::Private::FTaskBase::TryExecuteTask()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a312a500 Slop.exe!LowLevelTasks::TTaskDelegate<LowLevelTasks::FTask * __ptr64 __cdecl(bool),48>::TTaskDelegateImpl<LowLevelTasks::FTask::Init<UE::Tasks::Private::FTaskBase::Init’::2'::<lambda_1> >'::13’::<lambda_1>,0>::CallAndMove()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a31359ec Slop.exe!LowLevelTasks::FTask::ExecuteTask()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a313579d Slop.exe!LowLevelTasks::FScheduler::ExecuteTask()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a315adde Slop.exe!LowLevelTasks::FScheduler::WorkerLoop()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a312323a Slop.exe!operator<<()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a33ae544 Slop.exe!FThreadImpl::Run()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a37e3f88 Slop.exe!FRunnableThreadWin::Run()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ff6a37dceaf Slop.exe!FRunnableThreadWin::GuardedRun()
[2026.01.31-17.48.40:853][622]LogWindows: Error: [Callstack] 0x00007ffb8f3fe8d7 KERNEL32.DLL!UnknownFunction
[2026.01.31-17.48.40:853][622]LogWindows: Error:
[2026.01.31-17.48.40:853][622]LogWindows: Error: Crash in runnable thread Background Worker #6
[2026.01.31-17.48.40:869][622]LogExit: Executing StaticShutdownAfterError
[2026.01.31-17.48.40:870][622]LogWindows: FPlatformMisc::RequestExit(1, FRunnableThreadWin::GuardedRun.ExceptionHandler)
[2026.01.31-17.48.40:870][622]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, FRunnableThreadWin::GuardedRun.ExceptionHandler)
[2026.01.31-17.48.40:870][622]LogCore: Engine exit requested (reason: Win RequestExit)

EDIT: I should note that this seems to only happen in a development build. I tested a shipping build and had no crashes.

King_Zero · January 31, 2026, 7:08pm

it crashes on FAudioDevice::StopSoundsUsingResource (the critical error part). It seems to be an old issue that more people also faced in the past. Without epic’s update to the engine it most likely cannot be fixed, but I guess you could try and disable VoiP before changing the map and enabling it after loading? See if it works.

Me4tb4llm4rin4r4 · January 31, 2026, 7:31pm

Idk what I did. But it seems to be working fine now lol. Thanks for the help!