Unreal Engine Issues and Bug Tracker (UE-44130)

Description

Setting the `bUseClientSideCameraUpdates` property in a `PlayerCameraManager` class to false can result in a crash in the Ansel plugin because `GEngine->GameViewport` may be NULL.

Another user has submitted a pull request to correct this (PR # 3488).

Steps to Reproduce

Create a new code project.
Enable the Ansel plugin in the project.
Create a new PlayerCameraManager Blueprint.
Create a new PlayerController Blueprint and set it to use the PlayerCameraManager Blueprint created in step 3.
Create a new GameModeBase Blueprint and set it to use the PlayerController created in step 4.
Set the project to use the GameModeBase Blueprint created in step 5 as the project's GameMode.
Open the PlayerCameraManager Blueprint created in step 3.
Change the Player Camera Manager -> Use Client Side Camera Updates property to false.
Close the Editor.
Re-open the project in the Editor.
Open the PlayerController Blueprint that was created in step 4.

RESULT:
The Editor crashes.

EXPECTED:
The PlayerController Blueprint opens.

Callstack

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Engine!TWeakPtr<SWindow,0>::Pin() [d:\main-builds\stream\engine\source\runtime\core\public\templates\sharedpointer.h:1120]
UE4Editor_Engine!UGameViewportClient::GetWindow() [d:\main-builds\stream\engine\source\runtime\engine\classes\engine\gameviewportclient.h:308]
UE4Editor_Ansel!FNVAnselCameraPhotographyPrivate::ReconfigureAnsel() [d:\main-builds\stream\engine\plugins\runtime\nvidia\ansel\source\ansel\private\ansel.cpp:487]
UE4Editor_Ansel!FNVAnselCameraPhotographyPrivate::FNVAnselCameraPhotographyPrivate() [d:\main-builds\stream\engine\plugins\runtime\nvidia\ansel\source\ansel\private\ansel.cpp:126]
UE4Editor_Ansel!FAnselModule::CreateCameraPhotography() [d:\main-builds\stream\engine\plugins\runtime\nvidia\ansel\source\ansel\private\ansel.cpp:568]
UE4Editor_Engine!FCameraPhotographyManager::FCameraPhotographyManager() [d:\main-builds\stream\engine\source\runtime\engine\private\camera\cameraphotography.cpp:73]
UE4Editor_Engine!FCameraPhotographyManager::Get() [d:\main-builds\stream\engine\source\runtime\engine\private\camera\cameraphotography.cpp:118]
UE4Editor_Engine!APlayerCameraManager::UpdatePhotographyCamera() [d:\main-builds\stream\engine\source\runtime\engine\private\playercameramanager.cpp:1010]
UE4Editor_Engine!APlayerCameraManager::DoUpdateCamera() [d:\main-builds\stream\engine\source\runtime\engine\private\playercameramanager.cpp:988]
UE4Editor_Engine!APlayerCameraManager::UpdateCamera() [d:\main-builds\stream\engine\source\runtime\engine\private\playercameramanager.cpp:858]
UE4Editor_Engine!APlayerController::SpawnPlayerCameraManager() [d:\main-builds\stream\engine\source\runtime\engine\private\playercontroller.cpp:2505]
UE4Editor_Engine!APlayerController::PostInitializeComponents() [d:\main-builds\stream\engine\source\runtime\engine\private\playercontroller.cpp:956]
UE4Editor_Engine!AActor::PostActorConstruction() [d:\main-builds\stream\engine\source\runtime\engine\private\actor.cpp:2950]
UE4Editor_Engine!AActor::FinishSpawning() [d:\main-builds\stream\engine\source\runtime\engine\private\actor.cpp:2876]
UE4Editor_Engine!AActor::PostSpawnInitialize() [d:\main-builds\stream\engine\source\runtime\engine\private\actor.cpp:2818]
UE4Editor_Engine!UWorld::SpawnActor() [d:\main-builds\stream\engine\source\runtime\engine\private\levelactor.cpp:459]
UE4Editor_Engine!UWorld::SpawnActor() [d:\main-builds\stream\engine\source\runtime\engine\private\levelactor.cpp:291]
UE4Editor_Kismet!FBlueprintEditor::UpdatePreviewActor() [d:\main-builds\stream\engine\source\editor\kismet\private\blueprinteditor.cpp:8203]
UE4Editor_Kismet!FBlueprintEditor::Tick() [d:\main-builds\stream\engine\source\editor\kismet\private\blueprinteditor.cpp:7147]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [d:\main-builds\stream\engine\source\editor\unrealed\public\tickableeditorobject.h:21]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\main-builds\stream\engine\source\editor\unrealed\private\editorengine.cpp:1400]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\main-builds\stream\engine\source\editor\unrealed\private\unrealedengine.cpp:386]
UE4Editor!FEngineLoop::Tick() [d:\main-builds\stream\engine\source\runtime\launch\private\launchengineloop.cpp:3117]
UE4Editor!GuardedMain() [d:\main-builds\stream\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\main-builds\stream\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\main-builds\stream\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

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Duplicate

Component	UE - Graphics Features
Affects Versions	4.15.1, 4.17

Created	Apr 18, 2017
Resolved	Apr 18, 2017
Updated	Apr 27, 2018

UE-44130

Crash can occur in the Ansel plugin when setting Use Client Side Camera Updates to false in Player Camera Manager

Crash can occur in the Ansel plugin when setting Use Client Side Camera Updates to false in Player Camera Manager

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