Navigation crashing on PIE in absence of NavOctree

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Engine!UNavMeshRenderingComponent::GatherData() + 18874 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\navmeshrenderingcomponent.cpp:374]
UE4Editor_Engine!UNavMeshRenderingComponent::CreateSceneProxy() + 96 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\navmeshrenderingcomponent.cpp:35]
UE4Editor_Renderer!FScene::AddPrimitive() + 656 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\renderer\private\rendererscene.cpp:411]
UE4Editor_Engine!UNavMeshRenderingComponent::CreateRenderState_Concurrent() + 14 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\navmeshrenderingcomponent.cpp:49]
UE4Editor_Engine!UActorComponent::ExecuteRegisterEvents() + 228 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\actorcomponent.cpp:951]
UE4Editor_Engine!UActorComponent::RegisterComponentWithWorld() + 942 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\actorcomponent.cpp:749]
UE4Editor_Engine!AActor::IncrementalRegisterComponents() + 637 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\actor.cpp:3271]
UE4Editor_Engine!ULevel::IncrementalUpdateComponents() + 275 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\level.cpp:720]
UE4Editor_Engine!UWorld::UpdateWorldComponents() + 653 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\world.cpp:1205]
UE4Editor_Engine!UWorld::InitializeActorsForPlay() + 754 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\world.cpp:2831]
UE4Editor_Engine!UGameInstance::StartPIEGameInstance() + 1079 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\engine\private\gameinstance.cpp:195]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() + 8708 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\editor\unrealed\private\playlevel.cpp:2861]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() + 7184 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\editor\unrealed\private\playlevel.cpp:2212]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() + 643 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\editor\unrealed\private\playlevel.cpp:974]
UE4Editor_UnrealEd!UEditorEngine::Tick() + 3604 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\editor\unrealed\private\editor.cpp:1226]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() + 22 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\editor\unrealed\private\unrealedengine.cpp:347]
UE4Editor!FEngineLoop::Tick() + 4179 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2257]
UE4Editor!GuardedMain() + 1404 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() + 26 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [e:\downloads\unrealengine-4.7\unrealengine-4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

[4.7.3] Engine crashes when hitting play, NavMesh Fatal Error