Crash on clicking Column Header in visRT window

The Engine will crash when you run the visRT command in Editor and click on an item in the visRT window and the click on a column header.

also Reproduced in Main Promotable-CL-2513846

[Link Removed]

1. Open QAGame Editor
2. Open the Output Log Window
3. In the Output Log Window, type visRT
4. In the Visualization Window that pops up, click on the first item on the list (it will highlight to yellow)
5. Click on one of the column headers, 'size' for instance

RESULTS: After a pause, the engine crashes

EXPECTED: No Crash

Assertion failed: IsValid() [Link Removed] [Line: 698]

KERNELBASE.dll

+ 0 bytes
UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Core.dll!FOutputDevice::Logf__VA()

+ 159 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Core.dll!FDebug::AssertFailed()

+ 65 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Engine.dll!FVisualizeRTWidget::OnSelectionChanged()

+ 105 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\e
UE4Editor-Engine.dll!TBaseSPMethodDelegateInstance<0,FVisualizeRTWidget,0,TTypeWrapper<void> __cdecl(TSharedPtr<FRTInfo,0>,enum ESelectInfo::Type)>::Execute()

+ 55 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Engine.dll!TBaseSPMethodDelegateInstance<0,FVisualizeRTWidget,0,void __cdecl(TSharedPtr<FRTInfo,0>,enum ESelectInfo::Type)>::ExecuteIfSafe()

+ 40 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Engine.dll!TBaseDelegate<void,TSharedPtr<FRTInfo,0>,enum ESelectInfo::Type>::ExecuteIfBound()

+ 41 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Engine.dll!SListView<TSharedPtr<FRTInfo,0> >::Private_SignalSelectionChanged()

+ 33 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\s
UE4Editor-Engine.dll!SListView<TSharedPtr<FRTInfo,0> >::OnMouseButtonDown()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\s
UE4Editor-Slate.dll!<lambda_2944fcd867c13fce09ac1f6fe9cbe583>::operator()()

+ 21 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\s
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_2944fcd867c13fce09ac1f6fe9cbe583> >()

+ 47 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\s
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonDownEvent()

+ 102 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\s
UE4Editor-Slate.dll!FSlateApplication::OnMouseDown()

+ 19 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\s
UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage()

+ 32 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Core.dll!FWindowsApplication::DeferMessage()

+ 74 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Core.dll!FWindowsApplication::ProcessMessage()

+ 44 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor-Core.dll!FWindowsApplication::AppWndProc()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
USER32.dll

+ 0 bytes
USER32.dll

+ 0 bytes
UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages()

+ 48 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\c
UE4Editor.exe!FEngineLoop::Tick()

+ 8 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\l
UE4Editor.exe!GuardedMain()

+ 0 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\l
UE4Editor.exe!GuardedMainWrapper()

+ 5 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\l
UE4Editor.exe!WinMain()

+ 17 bytes [d:\buildfarm\buildmachine_++depot+ue4\engine\source\runtime\l
UE4Editor.exe!__tmainCRTStartup()

+ 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
kernel32.dll

+ 0 bytes
ntdll.dll

+ 0 bytes

Fix UE-51650

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