Description

This Jira was created from CrashReports submitted by the public due to the high number of occurrences. Descriptions from users are provided below.

Error message:

Assertion failed: LandscapeActor.IsNull() || LandscapeActor.Get() == Landscape [Link Removed] [Line: 1855]

Most recent user affected CL: 3106830

Logs:
[Link Removed]
[Link Removed]

Steps to Reproduce

Create a streaming level containing a landscape actor
Create another streaming level
In the levels window, select both streaming levels and then choose "merge..." from the "Levels" menu
crash

Callstack
UE4Editor_Landscape!ULandscapeInfo::UnregisterActor() [landscape.cpp:1856]
UE4Editor_Landscape!ALandscapeProxy::UnregisterAllComponents() [landscape.cpp:1033]
UE4Editor_Engine!AActor::BeginDestroy() [actor.cpp:475]
UE4Editor_CoreUObject!UObject::ConditionalBeginDestroy() [obj.cpp:739]
UE4Editor_CoreUObject!CollectGarbageInternal() [garbagecollection.cpp:1281]
UE4Editor_CoreUObject!CollectGarbage() [garbagecollection.cpp:1320]
UE4Editor_UnrealEd!UEditorEngine::Cleanse() [editorengine.cpp:1948]
UE4Editor_UnrealEd!EditorLevelUtils::RemoveLevelFromWorld() [editorlevelutils.cpp:413]
UE4Editor_WorldBrowser!FLevelCollectionModel::UnloadLevels() [levelcollectionmodel.cpp:630]
UE4Editor_WorldBrowser!FStreamingLevelCollectionModel::UnloadLevels() [streaminglevelcollectionmodel.cpp:142]
UE4Editor_WorldBrowser!FStreamingLevelCollectionModel::MergeSelectedLevels_Executed() [streaminglevelcollectionmodel.cpp:586]
UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,FStreamingLevelCollectionModel,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:317]
UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,FStreamingLevelCollectionModel,0,void __cdecl() [delegateinstancesimpl.h:423]
UE4Editor_Slate!FUICommandList::ExecuteAction() [uicommandlist.cpp:92]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [smenuentryblock.cpp:1027]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [smenuentryblock.cpp:987]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() [delegateinstanceinterface.h:161]
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() [tuple.h:115]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() [delegateinstancesimpl.h:317]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:521]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:278]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [smenuentryblock.cpp:385]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() [slateapplication.cpp:4901]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:4890]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5348]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5328]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1584]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:1930]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:747]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:669]
user32!<Unknown>
user32!<Unknown>
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:905]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:2788]
UE4Editor!GuardedMain() [launch.cpp:156]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:126]
UE4Editor!WinMain() [launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:264]
kernel32!<Unknown>
ntdll!<Unknown>

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Fixed
ComponentTools - Landscape
Affects Versions4.13
Target Fix4.14
Fix Commit3191437
Main Commit3152072
CreatedSep 21, 2016
ResolvedNov 23, 2016
UpdatedApr 12, 2018