Unreal Engine Issues and Bug Tracker (UE-50830)

Description

This is a somewhat common Landscape crash occurring throughout the 4.17 release.

User Descriptions

1) rename landscape layer, 2) delete layer in landscape tool

Source Context

 1307       FReply FLandscapeEditorCustomNodeBuilder_TargetLayers::OnTargetLayerDeleteClicked(const TSharedRef<FLandscapeTargetListInfo> Target)
 1308       {
 1309       	check(Target->LayerInfoObj.IsValid());
 1310 ***** 	check(Target->LandscapeInfo.IsValid());
 1311       
 1312       	if (FMessageDialog::Open(EAppMsgType::YesNo, LOCTEXT("Prompt_DeleteLayer", "Are you sure you want to delete this layer?")) == EAppReturnType::Yes)
 1313       	{
 1314       		FScopedTransaction Transaction(LOCTEXT("Undo_Delete", "Delete Layer"));
 1315       
 1316       		Target->LandscapeInfo->DeleteLayer(Target->LayerInfoObj.Get());
 1317       
 1318       		FEdModeLandscape* LandscapeEdMode = GetEditorMode();
 1319       		if (LandscapeEdMode)
 1320       		{
 1321       			LandscapeEdMode->UpdateTargetList();
 1322       		}
 1323       	}

Steps to Reproduce

Open QAGame
Open QA-Landscape map
In the Modes panel select Landscape mode and select the Paint option
Open M_LandscapeMaterial from the Content Browser
Select the Layer 'Layer 1' node in the graph
In the details panel change the Parameter name to Layer12 and save the material
Find Layer1_LayerInfo in the content browser and right click delete
Select Force Deletion
Scroll down to layers and click the X next to Layer1

Result: Crash

Callstack

Assertion failed: Target->LayerInfoObj.IsValid() 
[File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Editor\LandscapeEditor\Private\LandscapeEditorDetailCustomization_TargetLayers.cpp] [Line: 1310]

UE4Editor_LandscapeEditor!FLandscapeEditorCustomNodeBuilder_TargetLayers::OnTargetLayerDeleteClicked() [landscapeeditordetailcustomization_targetlayers.cpp:1311]
UE4Editor_LandscapeEditor!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int,0>,TSharedRef<FLandscapeTargetListInfo,0> >::ApplyAfter<FReply() [tuple.h:422]
UE4Editor_LandscapeEditor!TBaseStaticDelegateInstance<FReply __cdecl() [delegateinstancesimpl.h:958]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5199]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:232]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5188]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5690]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5670]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1718]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151]
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!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.17, 4.18
Target Fix	4.18

Fix Commit	3692583
Release Commit	3692583

Created	Oct 5, 2017
Resolved	Oct 12, 2017
Updated	Apr 27, 2018

View Jira Issue

UE-50830

[CrashReport] FLandscapeEditorCustomNodeBuilder_TargetLayers::OnTargetLayerDeleteClicked()

[CrashReport] FLandscapeEditorCustomNodeBuilder_TargetLayers::OnTargetLayerDeleteClicked()

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