[CrashReport] UE4Editor_Landscape!FLandscapeComponentSceneProxy::DrawStaticElements() [landscaperender.cpp:1631]

 1628       		if (HasTessellationEnabled)
 1629       		{
 1630 ***** 			UMaterialInstance* NonTessellatedLandscapeMI = Cast<UMaterialInstance>(AvailableMaterials[MaterialIndexToDisabledTessellationMaterial[i]]);
 1631       
 1632       			// Make sure that the Material instance we are going to use has the tessellation disabled
 1633       			UMaterialInstanceDynamic* NonTessellatedLandscapeMID = Cast<UMaterialInstanceDynamic>(NonTessellatedLandscapeMI);
 1634       			ULandscapeMaterialInstanceConstant* NonTessellatedLandscapeMIC = Cast<ULandscapeMaterialInstanceConstant>(NonTessellatedLandscapeMI);
 1635       
 1636       			if (NonTessellatedLandscapeMID != nullptr)
 1637       			{
 1638       				NonTessellatedLandscapeMIC = Cast<ULandscapeMaterialInstanceConstant>(NonTessellatedLandscapeMID->Parent);
 1639       			}

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 611] Array index out of bounds: -1 from an array of size 1

UE4Editor_Landscape!FLandscapeComponentSceneProxy::DrawStaticElements() [landscaperender.cpp:1631]
UE4Editor_Renderer!FPrimitiveSceneInfo::AddStaticMeshes() [primitivesceneinfo.cpp:152]
UE4Editor_Renderer!FPrimitiveSceneInfo::AddToScene() [primitivesceneinfo.cpp:211]
UE4Editor_Renderer!FScene::AddPrimitiveSceneInfo_RenderThread() [rendererscene.cpp:653]
UE4Editor_Renderer!<lambda_62fe13b83733dfa58d31fcd06f4bbe45>::operator() [rendererscene.cpp:880]
UE4Editor_Renderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FScene::AddPrimitive'::`2'::AddPrimitiveCommandName,<lambda_62fe13b83733dfa58d31fcd06f4bbe45> > >::ExecuteTask() [taskgraphinterfaces.h:829]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:679]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:575]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:333]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:467]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]