Crash on inputting Scalar Value in Grass Material Node

Crash occurs when inputting a Scalar Parameter into the New to 4,8 Grass Node.

Also reproduced in Main Promotable-CL-2535351

1. Open QAGame Editor
2. Create a New Material
3. Add the LandscapeGrassOutput Node
4. Add a Scalar Parameter
5. Attach the Scalar Parameter to the Grass Node

RESULTS: Editor Crashes

EXPECTED: NO Crash, if not possible a warning message.

Assertion failed: !CodeChunks[ResultIndex].UniformExpression || CodeChunks[ResultIndex].UniformExpression->IsConstant() [Link Removed] [Line: 817]

KERNELBASE.dll

+ 0 bytes
UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FOutputDevice::Logf__VA()

+ 159 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FDebug::AssertFailed()

+ 65 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!FHLSLMaterialTranslator::GetFixedParameterCode()

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

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Landscape.dll!UMaterialExpressionLandscapeGrassOutput::Compile()

+ 180 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!FHLSLMaterialTranslator::Translate()

+ 22 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!FMaterial::BeginCompileShaderMap()

+ 12 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!FMaterial::CacheShaders()

+ 25 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!FMaterial::CacheShaders()

+ 20 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Engine.dll!UMaterial::CacheShadersForResources()

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

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

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-CoreUObject.dll!UObject::PostEditChange()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-MaterialEditor.dll!FMaterialEditor::UpdatePreviewMaterial()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-MaterialEditor.dll!FMaterialEditor::UpdateMaterialAfterGraphChange()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-MaterialEditor.dll!FMaterialEditorUtilities::UpdateMaterialAfterGraphChange()

+ 9 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-UnrealEd.dll!UMaterialGraphSchema::TryCreateConnection()

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

+ 28 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-GraphEditor.dll!SGraphPin::OnDrop()

+ 123 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Slate.dll!<lambda_13af6b42409306e44b4e7065f2966a1b>::operator()()

+ 176 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_13af6b42409306e44b4e7065f2966a1b> >()

+ 21 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent()

+ 122 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Slate.dll!FSlateApplication::OnMouseUp()

+ 16 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage()

+ 12 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\sou
UE4Editor-Core.dll!FWindowsApplication::DeferMessage()

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

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

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

+ 0 bytes
USER32.dll

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

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

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

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

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

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

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

+ 0 bytes
ntdll.dll

+ 0 bytes

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