Crash copying all nodes in level blueprint of Audio.umap in ContentExamples

Crash attempting to copy all of the nodes in the Audio map of the ContentExamples project.

Crashreporter:
(link to specific crash) [Link Removed]
(link to bugg) [Link Removed]

Ensure condition failed: Node->IsValidLowLevel() [File:D:\BuildFarm\buildmachine_++depot+UE4\Engine\Source\Editor\GraphEditor\Private\SGraphEditorImpl.cpp] [Line: 139] Node is invalid

Tested on and occurring in:
UE4-Main: //depot/UE4/Promotable-CL-2545026
4.8 Binary: 4.8.0-2544947+++depot+UE4-Releases+4.8
4.8 Source: //depot/UE4-Releases/4.8/Promotable-CL-2544947

1. Open UE4Editor.exe ContentExamples Audio
2. Open the Level Blueprint
3. Click in the graph to focus it then use (Ctrl+A) to select all the nodes
4. Copy all the selected nodes using (Ctrl+C)

Result: Crash

UE4Editor_UnrealEd! FEdGraphUtilities::ExportNodesToText() edgraphutilities.cpp:285
UE4Editor_Kismet! FBlueprintEditor::CopySelectedNodes() blueprinteditor.cpp:4918
UE4Editor_Kismet! TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() delegateinstancesimpl_variadics.inl:282
UE4Editor_Kismet! TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() delegateinstancesimpl_variadics.inl:388
UE4Editor_Slate! FUICommandList::ConditionalProcessCommandBindings() uicommandlist.cpp:194
UE4Editor_Slate! FUICommandList::ProcessCommandBindings() uicommandlist.cpp:138
UE4Editor_GraphEditor! SGraphEditorImpl::OnKeyDown() sgrapheditorimpl.cpp:66
UE4Editor_Slate! <lambda_4f604f87f3ce3f5c3b6a1447676ad634>::operator() slateapplication.cpp:3763
UE4Editor_Slate! FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_4f604f87f3ce3f5c3b6a1447676ad634> >() slateapplication.cpp:212
UE4Editor_Slate! FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_4f604f87f3ce3f5c3b6a1447676ad634>,FKeyEvent>() slateapplication.cpp:194
UE4Editor_Slate! FSlateApplication::ProcessKeyDownEvent() slateapplication.cpp:3764
UE4Editor_Slate! FSlateApplication::OnKeyDown() slateapplication.cpp:3688
UE4Editor_Core! FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1262
UE4Editor_Core! FWindowsApplication::DeferMessage() windowsapplication.cpp:1711
UE4Editor_Core! FWindowsApplication::ProcessMessage() windowsapplication.cpp:706
UE4Editor_Core! FWindowsApplication::AppWndProc() windowsapplication.cpp:628
user32! <Unknown>
user32! <Unknown>
UE4Editor_Core! FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:792
UE4Editor! FEngineLoop::Tick() launchengineloop.cpp:2336
UE4Editor! GuardedMain() launch.cpp:142
UE4Editor! GuardedMainWrapper() launchwindows.cpp:126
UE4Editor! WinMain() launchwindows.cpp:295

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