Setting color in linear color struct variable within another struct crashes the editor

Setting color in linear color struct variable within another struct crashes the editor.

Frequency: 4/4

Regression (yes) issue (does not) occur in 4.11.2

1. Open Editor (any project)
2. Create new struct
3. Open struct
4. Change boolean variable to linear color
5. Select color in default values to set color value via color picker
6. Attempt to change color

Results

Editor crashes

Expected

Editor remains open, color switches to new default value.

MachineId:409D523543AE785961A2788C698A2F90
EpicAccountId:2e342bbd0e92480fa71bf4505b6a81c3

Fatal error: [Link Removed] [Line: 11]
Cast of nullptr to UserDefinedStructEditorData failed

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:440]
UE4Editor_CoreUObject!CastLogError() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\coreuobject\private\templates\casts.cpp:12]
UE4Editor_UnrealEd!CastChecked<UUserDefinedStructEditorData const ,UObject>() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\coreuobject\public\templates\casts.h:203]
UE4Editor_UnrealEd!FStructureEditorUtils::GetVarDesc() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\kismet2\structureeditorutils.cpp:590]
UE4Editor_UnrealEd!FStructureEditorUtils::GetGuidForProperty() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\unrealed\private\kismet2\structureeditorutils.cpp:800]
UE4Editor_Kismet!FDefaultValueDetails::OnFinishedChangingProperties() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\kismet\private\userdefinedstructureeditor.cpp:193]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FDefaultValueDetails,0,TTypeWrapper<void> __cdecl(FPropertyChangedEvent const & __ptr64)>::Execute() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:321]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FDefaultValueDetails,0,void __cdecl(FPropertyChangedEvent const & __ptr64)>::ExecuteIfSafe() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:428]
UE4Editor_PropertyEditor!TBaseMulticastDelegate<void,FPropertyChangedEvent const & __ptr64>::Broadcast() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:921]
UE4Editor_PropertyEditor!FPropertyHandleBase::NotifyFinishedChangingProperties() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:2137]
UE4Editor_DetailCustomizations!FColorStructCustomization::OnSetColorFromColorPicker() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\detailcustomizations\private\colorstructcustomization.cpp:268]
UE4Editor_DetailCustomizations!TBaseSPMethodDelegateInstance<0,FColorStructCustomization,0,void __cdecl(FLinearColor)>::ExecuteIfSafe() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:428]
UE4Editor_AppFramework!TBaseDelegate<void,FLinearColor>::ExecuteIfBound() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:612]
UE4Editor_AppFramework!SColorPicker::UpdateColorPick() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:768]
UE4Editor_AppFramework!SColorPicker::UpdateColorPickMouseUp() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:754]
UE4Editor_AppFramework!SColorPicker::ApplyNewTargetColor() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:734]
UE4Editor_AppFramework!SColorPicker::SetNewTargetColorHSV() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\appframework\private\widgets\colors\scolorpicker.cpp:714]
UE4Editor_AppFramework!TBaseSPMethodDelegateInstance<0,SColorPicker,0,void __cdecl(FLinearColor)>::ExecuteIfSafe() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:428]
UE4Editor_Slate!SColorWheel::ProcessMouseAction() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\widgets\colors\scolorwheel.cpp:151]
UE4Editor_Slate!SColorWheel::OnMouseButtonDown() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\widgets\colors\scolorwheel.cpp:43]
UE4Editor_Slate!<lambda_7097b900f0e4be30d80fb18f98c51ea0>::operator()() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4518]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_7097b900f0e4be30d80fb18f98c51ea0> >() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4507]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4465]
UE4Editor_Slate!FSlateApplication::OnMouseDown() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4399]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1515]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1847]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:742]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:664]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:903]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2729]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launch.cpp:148]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

Crashing when selecting Color in a Struct