Unreal Engine Issues and Bug Tracker (UE-41560)

Description

In cascade if you add particle LODs then remove, clear the LOD settings array, then attempt to add more LODs (after current) the editor will crash. This crash will only occur if you add LODs after current LOD not if you choose the add before LOD option.

Steps to Reproduce

Open any project
Create new Particle System and open
In Cascade, add an LOD after current
Delete the LOD using the Red X icon
Using the garbage can icon next to LOD Settings, empty out that array.(located in details panel)
Add another LOD after current

RESULT
Editor will crash

EXPECTED
Particle LOD is added successfully

Callstack

VCRUNTIME140!memcpy() memcpy.asm:135 
UE4Editor_Cascade!TArray<FParticleSystemLOD,FDefaultAllocator>::InsertZeroed() array.h:1267 
UE4Editor_Cascade!FCascade::AddLOD() cascade.cpp:3447 
UE4Editor_Cascade!TBaseSPMethodDelegateInstance<0,FCascade,0,TTypeWrapper<void> __cdecl() delegateinstancesimpl.h:318 
UE4Editor_Cascade!TBaseSPMethodDelegateInstance<0,FCascade,0,void __cdecl() delegateinstancesimpl.h:424 
UE4Editor_Slate!FUICommandList::ExecuteAction() uicommandlist.cpp:92 
UE4Editor_Slate!SToolBarButtonBlock::OnClicked() stoolbarbuttonblock.cpp:300 
UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply() delegateinstanceinterface.h:161 
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply() tuple.h:116 
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl() delegateinstancesimpl.h:318 
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl.inl:522 
UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:275 
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() slateapplication.cpp:5010 
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() slateapplication.cpp:215 
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:4999 
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5462 
UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5439 
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1652 
UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:2071 
UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:814 
UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:678 
user32!UserCallWinProcCheckWow() 
user32!DispatchMessageWorker() 
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:951 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2811 
UE4Editor!GuardedMain() launch.cpp:152 
UE4Editor!GuardedMainWrapper() launchwindows.cpp:126 
UE4Editor!WinMain() launchwindows.cpp:202 
UE4Editor!__scrt_common_main_seh() exe_common.inl:264 
kernel32!BaseThreadInitThunk() 
ntdll!RtlUserThreadStart()

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Fixed

Component	UE - Graphics Features
Affects Versions	4.14.3, 4.15
Target Fix	4.17

Fix Commit	3402280
Main Commit	3461201

Created	Feb 3, 2017
Resolved	Apr 20, 2017
Updated	Apr 27, 2018

UE-41560

Cascade Crashes Engine When Adding Particle LOD After Clearing LOD Settings

Cascade Crashes Engine When Adding Particle LOD After Clearing LOD Settings

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