LIVE: Editor crashes when attempting to use erosion tool on landscape (4.6 preview)

The editor crashes while attempting to use the erosion tool on a landscape in editor.

Frequency: 2/2

Callstack:
<unknown module>! KERNELBASE!RaiseException()
<unknown module>! UE4Editor_Core!FOutputDeviceWindowsError::Serialize()
<unknown module>! UE4Editor_Core!FOutputDevice::Logf__VA()
<unknown module>! UE4Editor_Core!FDebug::AssertFailed()
<unknown module>! UE4Editor_LandscapeEditor!FLandscapeFullWeightCache::GetCachedData()
<unknown module>! UE4Editor_LandscapeEditor!FLandscapeToolStrokeErosion::Apply()
<unknown module>! UE4Editor_LandscapeEditor!FLandscapeToolBase<FLandscapeToolStrokeErosion>::BeginTool()
<unknown module>! UE4Editor_LandscapeEditor!FEdModeLandscape::InputKey()
<unknown module>! UE4Editor_UnrealEd!FEditorModeTools::InputKey()
<unknown module>! UE4Editor_UnrealEd!FLevelEditorViewportClient::InputKey()
<unknown module>! UE4Editor_Engine!FSceneViewport::OnMouseButtonDown()
<unknown module>! UE4Editor_Slate!SViewport::OnMouseButtonDown()
<unknown module>! UE4Editor_Slate!<lambda_588f95cfa31b17d66f0bf68924ffcb57>::operator()
<unknown module>! UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_588f95cfa31b17d66f0bf68924ffcb57> >()
<unknown module>! UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent()
<unknown module>! UE4Editor_Slate!FSlateApplication::OnMouseDown()
<unknown module>! UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage()
<unknown module>! UE4Editor_Core!FWindowsApplication::DeferMessage()
<unknown module>! UE4Editor_Core!FWindowsApplication::ProcessMessage()
<unknown module>! UE4Editor_Core!FWindowsApplication::AppWndProc()
<unknown module>! user32!UserCallWinProcCheckWow()
<unknown module>! user32!DispatchMessageWorker()
<unknown module>! UE4Editor_Core!FWindowsPlatformMisc::PumpMessages()
<unknown module>! UE4Editor!FEngineLoop::Tick()
<unknown module>! UE4Editor!GuardedMain()
<unknown module>! UE4Editor!GuardedMainWrapper()
<unknown module>! UE4Editor!WinMain()
<unknown module>! UE4Editor!__tmainCRTStartup()

CrashReporter: [Link Removed]

1. Open Editor (any project)
2. Create a new landscape
3. In landscape mode, switch to erosion tool
4. LMB on landscape

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