Unreal Engine Issues and Bug Tracker (UE-96775)

Description

The Editor crashes when attempting to convert a Landscape into a Blueprint Class. Looking back to //UE4/Release-4.24 cl 11590231, this option seems to be unselectable (see attached image), which leads me to believe this is not an expected workflow for normal users.

We need to either support landscape conversions to blueprint classes or prevent the user from making this selection in the first place.

For the above reasons, I am marking this as a regression.

Steps to Reproduce

Open any project
Enter Landscape mode (Shift + 2)
Create a default Landscape
Enter Selection mode (Shift + 1)
Select the created Landscape
At the top of the viewport toolbar, click on the dropdown arrow next to Blueprint
Select "Convert selection to Blueprint Class"
Select an Actor class and click OK

Result
Editor crashes when attempting the conversion

Expected
Either the user is unable to convert Landscapes into Blueprint Classes
or
The conversion is successful and no crash occurs.

Callstack

Assertion failed: OwningWorld [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/Landscape/Private/Landscape.cpp] [Line: 1176]

UE4Editor_Core!AssertFailedImplV() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:100]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:450]
UE4Editor_Landscape!ALandscapeProxy::CreateLandscapeInfo() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Landscape\Private\Landscape.cpp:1176]
UE4Editor_Landscape!ALandscape::PostDuplicate() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeEdit.cpp:3772]
UE4Editor_CoreUObject!StaticDuplicateObjectEx() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:2106]
UE4Editor_CoreUObject!StaticDuplicateObject() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1961]
UE4Editor_Engine!UChildActorComponent::Serialize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Components\ChildActorComponent.cpp:127]
UE4Editor_Engine!UEngine::CopyPropertiesForUnrelatedObjects() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\UnrealEngine.cpp:14329]
UE4Editor_UnrealEd!<lambda_f5799eb5e2a566f27805504d34d93414>::operator()() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:1126]
UE4Editor_UnrealEd!FKismetEditorUtilities::AddComponentsToBlueprint() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:1242]
UE4Editor_UnrealEd!<lambda_ee77cf9719fc942cfb9f8593d710ffcd>::operator()() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:1756]
UE4Editor_UnrealEd!CreateBlueprintFromActors_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:1574]
UE4Editor_UnrealEd!FKismetEditorUtilities::CreateBlueprintFromActors() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:1778]
UE4Editor_UnrealEd!FKismetEditorUtilities::CreateBlueprintFromActors() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:1059]
UE4Editor_KismetWidgets!FCreateBlueprintFromActorDialog::OnCreateBlueprint() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\KismetWidgets\Private\CreateBlueprintFromActorDialog.cpp:846]
UE4Editor_KismetWidgets!FCreateBlueprintFromActorDialog::OpenDialog() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\KismetWidgets\Private\CreateBlueprintFromActorDialog.cpp:787]
UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:859]
UE4Editor_Slate!FUICommandList::ExecuteAction() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:102]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1059]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1019]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:298]
UE4Editor_Slate!SButton::ExecuteOnClick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
UE4Editor_Slate!SButton::OnMouseButtonUp() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:386]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:372]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4675]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5198]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5166]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2140]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2592]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1816]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:852]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
UE4Editor!FEngineLoop::Tick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4762]
UE4Editor!GuardedMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor!GuardedMainWrapper() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!WinMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.25
Target Fix	4.26

Fix Commit	14155319
Main Commit	14155319

Created	Aug 12, 2020
Resolved	Aug 20, 2020
Updated	Feb 16, 2021

UE-96775

Crash when converting a Landscape to a Blueprint Class

Crash when converting a Landscape to a Blueprint Class

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