Force Delete of Referenced SpeedTree Instance causes Crash

 1873       
 1874       			SpeedTreeWindComputationMap.Remove(StaticMesh);
 1875       			WindComputation->UniformBuffer.ReleaseResource();
 1876       			delete WindComputation;
 1877       		}
 1878       	}
 1879       }
 1880       
 1881       void FScene::UpdateSpeedTreeWind(double CurrentTime)
 1882       {
 1883       #define SET_SPEEDTREE_TABLE_FLOAT4V(name, offset) \
 1884       	UniformParameters.name = *(FVector4*)(WindShaderValues + FSpeedTreeWind::offset); \
 1885       	UniformParameters.Prev##name = *(FVector4*)(WindShaderValues + FSpeedTreeWind::offset + FSpeedTreeWind::NUM_SHADER_VALUES);
 1886       
 1887 ***** 	ENQUEUE_UNIQUE_RENDER_COMMAND_TWOPARAMETER(
 1888       		FUpdateSpeedTreeWindCommand,
 1889       		FScene*,Scene,this,
 1890       		double,CurrentTime,CurrentTime,
 1891       		{
 1892       			FVector WindDirection;
 1893       			float WindSpeed;
 1894       			float WindMinGustAmt;
 1895       			float WindMaxGustAmt;
 1896       			Scene->GetDirectionalWindParameters(WindDirection, WindSpeed, WindMinGustAmt, WindMaxGustAmt);
 1897       
 1898       			for (TMap<const UStaticMesh*, FSpeedTreeWindComputation*>::TIterator It(Scene->SpeedTreeWindComputationMap); It; ++It )
 1899       			{
 1900       				const UStaticMesh* StaticMesh = It.Key();
 1901       				FSpeedTreeWindComputation* WindComputation = It.Value();
 1902       

UE4Editor_Renderer!`FScene::UpdateSpeedTreeWind'::`2'::EURCMacro_FUpdateSpeedTreeWindCommand::DoTask() [rendererscene.cpp:1888]
UE4Editor_Renderer!TGraphTask<`FScene::UpdateSpeedTreeWind'::`2'::EURCMacro_FUpdateSpeedTreeWindCommand>::ExecuteTask() [taskgraphinterfaces.h:868]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:932]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:679]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:319]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:440]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:74]