Description

This is occurring in both 4.18 and 4.19 release branches.

Steps to Reproduce
  1. Open any project in the editor
  2. Create a landscape
  3. Select the landscape
  4. Copy the landscape and select Yes on the dialog message
  5. Paste the landscape
  6. Translate the pasted landscape in any direction
  7. Ctrl-Z to undo the translation

Result: Ensure occurs

Callstack
UE4Editor_Landscape!ULandscapeComponent::GetLayerDebugColorKey() landscape.cpp:445 
UE4Editor_Landscape!ULandscapeComponent::PostEditUndo() landscapeedit.cpp:420 
UE4Editor_UnrealEd!FTransaction::Apply() editortransaction.cpp:506 
UE4Editor_UnrealEd!UTransBuffer::Undo() editortransaction.cpp:891 
UE4Editor_UnrealEd!UEditorEngine::Exec_Transaction() editorserver.cpp:5046 
UE4Editor_UnrealEd!UEditorEngine::Exec() editorserver.cpp:5493 
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() unrealedsrv.cpp:672 
UE4Editor_MainFrame!FMainFrameActionCallbacks::ExecuteExecCommand() mainframeactions.cpp:1014 
UE4Editor_MainFrame!TBaseStaticDelegateInstance<void __cdecl() delegateinstancesimpl.h:1027 
UE4Editor_Slate!FUICommandList::ConditionalProcessCommandBindings() uicommandlist.cpp:216 
UE4Editor_Slate!FUICommandList::ProcessCommandBindings() uicommandlist.cpp:160 
UE4Editor_MainFrame!FMainFrameActionCallbacks::OnUnhandledKeyDownEvent() mainframeactions.cpp:212 
UE4Editor_MainFrame!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<FReply() tuple.h:497 
UE4Editor_MainFrame!TBaseStaticDelegateInstance<FReply __cdecl() delegateinstancesimpl.h:958 
UE4Editor_Slate!TBaseDelegate<FReply,FKeyEvent const & __ptr64>::Execute() delegatesignatureimpl.inl:537 
UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() slateapplication.cpp:4845 
UE4Editor_Slate!FSlateApplication::OnKeyDown() slateapplication.cpp:4744 
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1560 
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() windowsapplication.cpp:2171 
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() windowsapplication.cpp:888 
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() windowsapplication.cpp:725 
user32!<Unknown> 
user32!<Unknown> 
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() windowsplatformapplicationmisc.cpp:129 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:3220 
UE4Editor!GuardedMain() launch.cpp:166 
UE4Editor!GuardedMainWrapper() launchwindows.cpp:134 
UE4Editor!WinMain() launchwindows.cpp:210 
UE4Editor!__scrt_common_main_seh() exe_common.inl:253 
kernel32!<Unknown> 
ntdll!<Unknown> 

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Fixed
ComponentTools - Landscape
Affects Versions4.18.34.19
Target Fix4.19
Fix Commit3857898
Main Commit3990065
Release Commit3857898
CreatedJan 24, 2018
ResolvedJan 26, 2018
UpdatedApr 27, 2018