[CrashReport] UE4Editor_ShaderCore!FVertexFactory::SetPositionStream() [vertexfactory.cpp:218]

  213       void FVertexFactory::SetPositionStream(FRHICommandList& RHICmdList) const
  214       {
  215       	check(IsInitialized());
  216       	// Set the predefined vertex streams.
  217 ***** 	for(int32 StreamIndex = 0;StreamIndex < PositionStream.Num();StreamIndex++)
  218       	{
  219       		const FVertexStream& Stream = PositionStream[StreamIndex];
  220       		check(Stream.VertexBuffer->IsInitialized());
  221       		RHICmdList.SetStreamSource( StreamIndex, Stream.VertexBuffer->VertexBufferRHI, Stream.Offset);
  222       	}
  223       }

Assertion failed: IsInitialized() [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\ShaderCore\Private\VertexFactory.cpp] [Line: 216]

UE4Editor_ShaderCore!FVertexFactory::SetPositionStream() [vertexfactory.cpp:218]
UE4Editor_Renderer!TStaticMeshDrawList<FPositionOnlyDepthDrawingPolicy>::DrawElement<2>() [staticmeshdrawlist.inl:186]
UE4Editor_Renderer!TStaticMeshDrawList<FPositionOnlyDepthDrawingPolicy>::DrawVisibleInner<2>() [staticmeshdrawlist.inl:400]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderPrePassView() [depthrendering.cpp:943]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderPrePass() [depthrendering.cpp:1328]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [deferredshadingrenderer.cpp:798]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [scenerendering.cpp:2854]
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`33'::EURCMacro_FDrawSceneCommand>::ExecuteTask() [taskgraphinterfaces.h:829]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:665]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:574]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:333]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:467]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]