The in UE-30242 has been tested in Preview 3 (CL 2970308) and was confirmed to no longer be occurring. Are you still experiencing this crash (partial callstack below) on Preview 5? If so, please create a new post on the Answerhub in the Bug Reports section and we will follow up with you.
UE4Editor_Engine!AActor::RerunConstructionScripts() [d:\build\++ue4+release-+compile\sync\engine\source\runtime\engine\private\actorconstruction.cpp:214]
UE4Editor_Engine!AActor::PostEditChangeProperty() [d:\build\++ue4+release-+compile\sync\engine\source\runtime\engine\private\actoreditor.cpp:118]
UE4Editor_CoreUObject!UObject::PostEditChange() [d:\build\++ue4+release-+compile\sync\engine\source\runtime\coreuobject\private\uobject\obj.cpp:285]
UE4Editor_UnrealEd!FBlueprintEditorUtils::PostEditChangeBlueprintActors() [d:\build\++ue4+release-+compile\sync\engine\source\editor\unrealed\private\kismet2\blueprinteditorutils.cpp:7391]
UE4Editor_Kismet!FBlueprintEditor::OnBlueprintChangedImpl() [d:\build\++ue4+release-+compile\sync\engine\source\editor\kismet\private\blueprinteditor.cpp:3113]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(UBlueprint * __ptr64)>::Execute() [d:\build\++ue4+release-+compile\sync\engine\source\runtime\core\\delegates\delegateinstancesimpl_variadics.inl:321]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(UBlueprint * __ptr64)>::ExecuteIfSafe() [d:\build\++ue4+release-+compile\sync\engine\source\runtime\core\\delegates\delegateinstancesimpl_variadics.inl:428]