Crash when Editing Text in Libraries Category Text field within Material Functions

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:440]
UE4Editor_MaterialEditor!FMaterialEditor::NotifyPreChange() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\materialeditor\private\materialeditor.cpp:3573]
UE4Editor_PropertyEditor!FPropertyNode::NotifyPreChange() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\propertyeditor\private\propertynode.cpp:1875]
UE4Editor_PropertyEditor!FPropertyValueImpl::ImportText() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:422]
UE4Editor_PropertyEditor!<lambda_8f13062a9a5915f6c12df7175a25838d>::operator()() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:1950]
UE4Editor_PropertyEditor!FPropertyValueImpl::EnumerateObjectsToModify() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:43]
UE4Editor_PropertyEditor!FPropertyHandleBase::SetPerObjectValue() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\propertyeditor\private\propertyhandleimpl.cpp:1938]
UE4Editor_DetailCustomizations!`anonymous namespace'::FEditableTextPropertyHandle::SetText() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\detailcustomizations\private\textcustomization.cpp:79]
UE4Editor_EditorWidgets!STextPropertyEditableTextBox::OnTextCommitted() [d:\build\++ue4+release-4.12+compile\sync\engine\source\editor\editorwidgets\private\stextpropertyeditabletextbox.cpp:272]
UE4Editor_EditorWidgets!TBaseSPMethodDelegateInstance<0,STextPropertyEditableTextBox,0,TTypeWrapper<void> __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::Execute() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:321]
UE4Editor_EditorWidgets!TBaseSPMethodDelegateInstance<0,STextPropertyEditableTextBox,0,void __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::ExecuteIfSafe() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:428]
UE4Editor_Slate!TBaseDelegate<void,FText const & __ptr64,enum ETextCommit::Type>::ExecuteIfBound() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:608]
UE4Editor_Slate!FSlateEditableTextLayout::HandleCarriageReturn() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\widgets\text\slateeditabletextlayout.cpp:1265]
UE4Editor_Slate!FSlateEditableTextLayout::HandleKeyDown() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\widgets\text\slateeditabletextlayout.cpp:773]
UE4Editor_Slate!SEditableText::OnKeyDown() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\widgets\input\seditabletext.cpp:181]
UE4Editor_Slate!<lambda_7c66138389984533974223608bc6375f>::operator()() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4232]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_7c66138389984533974223608bc6375f> >() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor_Slate!FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_7c66138389984533974223608bc6375f>,FKeyEvent>() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:197]
UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4230]
UE4Editor_Slate!FSlateApplication::OnKeyDown() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4147]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1342]
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:2728]
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