Copy, Paste and Hover a Material Layer Blend Node causes Crash

In the Material Editor, if all Live Previews are turned off, copying and pasting a Material Layer Blend Node will crash when the tool tip is being processed.

Also Reproduced in Main Promotable-CL-2605107

[Link Removed]

1. Open QAGame Editor
2. Open or Create A Material
3. Disable Live Preview, Live Nodes, and Live Update
4. Add any Material Layer Blend Node
5. Copy and Paste added node
6. Hover over pasted node (to trigger tooltip) - NOTE: This may take a moment, no more than a few seconds.

RESULTS: CRASH

EXPECTED: NO CRASH

Fatal error! Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000108 UE4Editor-Engine.dll!ConvertToMultilineToolTip()

{0x000007fec9c5c850}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Engine.dll!UMaterialExpressionMaterialFunctionCall::GetConnectorToolTip()

{0x000007fec9c79af9}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-UnrealEd.dll!UMaterialGraphNode::GetPinHoverText()

{0x000007fee4a4bca2}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!SGraphPin::GetTooltipText()

{0x000007fee8abe549}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!TMemberFunctionCaller<SGraphPin,FText (__cdecl SGraphPin::*)(void)const __ptr64>::operator()<>()

{0x000007fee893f500}

+ 15 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!TTupleImpl<TIntegerSequence<> >::ApplyAfter_ExplicitReturnType<FText,TMemberFunctionCaller<SGraphPin,FText (__cdecl SGraphPin::*)(void)const __ptr64> >()

{0x000007fee8943789}

+ 19 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-GraphEditor.dll!TBaseSPMethodDelegateInstance<1,SGraphPin,0,FText __cdecl(void)>::Execute()

{0x000007fee8a80e89}

+ 36 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!TBaseDelegate<FText>::Execute()

{0x000007feea682a9a}

+ 6 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!TAttribute<FText>::Get()

{0x000007feea68afa8}

+ 14 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!SToolTip::IsEmpty()

{0x000007feea780bf2}

+ 30 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!FSlateApplication::UpdateToolTip()

{0x000007feea6eeb81}

+ 20 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!FSlateApplication::ProcessMouseMoveEvent()

{0x000007feea6c8ad8}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Slate.dll!FSlateApplication::OnMouseMove()

{0x000007feea6b5b51}

+ 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage()

{0x000007feeae5d131}

+ 10 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::DeferMessage()

{0x000007feeae445c1}

+ 74 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::ProcessMessage()

{0x000007feeae5e99f}

+ 44 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor-Core.dll!FWindowsApplication::AppWndProc()

{0x000007feeae3e1aa}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou USER32.dll

{0x0000000077269bd1}

+ 0 bytes USER32.dll

{0x00000000772698da}

+ 0 bytes UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages()

{0x000007feeae5fd56}

+ 48 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!FEngineLoop::Tick()

{0x000000013f4e3c7a}

+ 8 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!GuardedMain()

{0x000000013f4d49cc}

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!GuardedMainWrapper()

{0x000000013f4d4a4a}

+ 5 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!WinMain()

{0x000000013f4e65c9}

+ 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou UE4Editor.exe!__tmainCRTStartup()

{0x000000013f4e75d9}

+ 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618] kernel32.dll

{0x00000000773659ed}

+ 0 bytes ntdll.dll

{0x000000007749c541} + 0 bytes ntdll.dll {0x000000007749c541}

+ 0 bytes