This is a somewhat common Landscape crash occurring throughout the 4.17 release.
User Descriptions
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 }
Result: Crash
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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50830 in the post.