Access violation - code c0000005 (first/second chance not available)

Crash Reporter: [Link Removed]

Opening a project created in 4.6.1 with 4.7 built from GitHub branch 20150203 (last commit: 5bac1375be31053932c7b9123cc3bb94c70dd5e0) results in crash.

Unable to reproduce locally

MachineId:D47B853049B93D1BF2971CB4BB59413F
UserName:user

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Engine!UBlueprintGeneratedClass::FindArchetype() + 23 bytes [c:\github\unrealengine\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:262]
UE4Editor_CoreUObject!UObject::GetArchetypeFromRequiredInfo() + 388 bytes [c:\github\unrealengine\engine\source\runtime\coreuobject\private\uobject\uobjectarchetype.cpp:53]
UE4Editor_CoreUObject!ULinkerLoad::CreateExport() + 3692 bytes [c:\github\unrealengine\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3271]
UE4Editor_CoreUObject!ULinkerLoad::CreateExportAndPreload() + 27 bytes [c:\github\unrealengine\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2503]
UE4Editor_CoreUObject!ULinkerLoad::LoadAllObjects() + 589 bytes [c:\github\unrealengine\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2583]
UE4Editor_CoreUObject!LoadPackageInternal() + 2055 bytes [c:\github\unrealengine\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:896]
UE4Editor_UnrealEd!UEditorEngine::Map_Load() + 5034 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\editorserver.cpp:2245]
UE4Editor_UnrealEd!UEditorEngine::HandleMapCommand() + 349 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\editorserver.cpp:5676]
UE4Editor_UnrealEd!UEditorEngine::Exec() + 797 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\editorserver.cpp:5176]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() + 273 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\unrealedsrv.cpp:740]
UE4Editor_UnrealEd!FEditorFileUtils::LoadMap() + 789 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\filehelpers.cpp:1910]
UE4Editor_UnrealEd!FEditorFileUtils::LoadDefaultMapAtStartup() + 216 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\filehelpers.cpp:3070]
UE4Editor_UnrealEd!FUnrealEdMisc::OnInit() + 2244 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\unrealedmisc.cpp:294]
UE4Editor_UnrealEd!EditorInit() + 3254 bytes [c:\github\unrealengine\engine\source\editor\unrealed\private\unrealed.cpp:86]
UE4Editor!GuardedMain() + 285 bytes [c:\github\unrealengine\engine\source\runtime\launch\private\launch.cpp:123]
UE4Editor!GuardedMainWrapper() + 26 bytes [c:\github\unrealengine\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [c:\github\unrealengine\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

What does a Graph get-variable node mean?