Description

The Unreal Editor will crash whenever you try and build lighting.

Crash does not occur in:
4.14.2 - 3241561

Steps to Reproduce
  1. Create a First Person Blueprint Project.
  2. Select the drop-down next to Build and select Build Lighting Only.

Result: The editor will crash.

Callstack
UE4Editor-MetalRHI.dylib!FMetalRenderPass::RestartRenderPass() 
UE4Editor-MetalRHI.dylib!FMetalContext::PrepareToDraw() 
UE4Editor-MetalRHI.dylib!FMetalRHICommandContext::RHIEndDrawPrimitiveUP() 
UE4Editor-Renderer.dylib!DrawPrimitiveUP() 
UE4Editor-Renderer.dylib!FMeshDrawingPolicy::DrawMesh() 
UE4Editor-Renderer.dylib!void FDrawBasePassDynamicMeshAction::Process<FUniformLightMapPolicy>() 
UE4Editor-Renderer.dylib!void ProcessBasePassMesh<FDrawBasePassDynamicMeshAction>() 
UE4Editor-Renderer.dylib!FBasePassOpaqueDrawingPolicyFactory::DrawDynamicMesh() 
UE4Editor-Renderer.dylib!FRendererModule::DrawTileMesh() 
UE4Editor-Engine.dylib!FTileRenderer::DrawTile() 
UE4Editor-Engine.dylib!TEnqueueUniqueRenderCommandType<FCanvasTileRendererItem::Render_GameThread(FCanvas const*)::DrawTileCommandName, FCanvasTileRendererItem::Render_GameThread(FCanvas const*)::$_0>::DoTask()
UE4Editor-Engine.dylib!TGraphTask<TEnqueueUniqueRenderCommandType<FCanvasTileRendererItem::Render_GameThread(FCanvas const*)::DrawTileCommandName, FCanvasTileRendererItem::Render_GameThread(FCanvas const*)::$_0> >::ExecuteTask()
UE4Editor-Core.dylib!FNamedTaskThread::ProcessTasksNamedThread() 
UE4Editor-Core.dylib!FNamedTaskThread::ProcessTasksUntilQuit() 
UE4Editor-Core.dylib!FTaskGraphImplementation::ProcessThreadUntilRequestReturn() 
UE4Editor-RenderCore.dylib!RenderingThreadMain() 
UE4Editor-RenderCore.dylib!FRenderingThread::Run() 
UE4Editor-Core.dylib!FRunnableThreadPThread::Run() 
UE4Editor-Core.dylib!FRunnableThreadPThread::_ThreadProc() 
libsystem_pthread.dylib!<Unknown> 
libsystem_pthread.dylib!<Unknown> 
libsystem_pthread.dylib!<Unknown> 

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Fixed
ComponentUE - Graphics Features
Affects Versions4.15
Target Fix4.15
Fix Commit3253807
Main Commit3389599
Release Commit3253807
CreatedJan 4, 2017
ResolvedJan 11, 2017
UpdatedApr 27, 2018