Description

A crash occurs when you building lighting with a project using Lighting Scenarios on a Mac.

I attempted to reproduce the issue using a new blank project, but was unable to get the crash to occur. The user reporting the issue has provided a project for testing which crashes immediately upon building lighting.

I also tested this issue on PC and the crash does not occur.

Steps to Reproduce

1. Download and Open attached project.
2. Build Lighting.

Outcome Crash occurs.

Expected The lighting builds without a crash.

Callstack

libsystem_kernel.dylib!<Unknown>
libsystem_kernel.dylib!<Unknown>
libobjc.A.dylib!Unknown()
libobjc.A.dylib!Unknown()
libobjc.A.dylib!Unknown()
CoreFoundation!Unknown()
Foundation!Unknown()
UE4Editor-Core.dylib!FMacApplication::OnWindowDidResize(TSharedRef<FMacWindow,()
UE4Editor-Core.dylib!<Unknown>
UE4Editor-Core.dylib!<Unknown>
UE4Editor-Core.dylib!FCocoaRunLoopSource::Process()
UE4Editor-Core.dylib!<Unknown>
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
UE4Editor-Core.dylib!PerformBlockOnThread(FCocoaRunLoopSource&, void()
UE4Editor-Core.dylib!MainThreadCall(void()
UE4Editor-Core.dylib!FMacWindow::ReshapeWindow()
UE4Editor-SlateCore.dylib!SWindow::Resize()
UE4Editor-Slate.dylib!PrepassWindowAndChildren(TSharedRef<SWindow,()
UE4Editor-Slate.dylib!FSlateApplication::DrawPrepass(TSharedPtr<SWindow,()
UE4Editor-Slate.dylib!FSlateApplication::PrivateDrawWindows(TSharedPtr<SWindow,()
UE4Editor-Slate.dylib!FSlateApplication::DrawWindows()
UE4Editor-Slate.dylib!FSlateApplication::TickApplication()
UE4Editor-Slate.dylib!FSlateApplication::AddModalWindow(TSharedRef<SWindow, (ESPMode)0>, TSharedPtr<SWidget const,()
UE4Editor-UnrealEd.dylib!UEditorEngine::EditorAddModalWindow(TSharedRef<SWindow,()
UE4Editor-UnrealEd.dylib!FSuppressableWarningDialog::ShowModal()
UE4Editor-UnrealEd.dylib!FStaticLightingSystem::BeginLightmassProcess()
UE4Editor-UnrealEd.dylib!FStaticLightingManager::CreateStaticLightingSystem()
UE4Editor-UnrealEd.dylib!UEditorEngine::BuildLighting()
UE4Editor-UnrealEd.dylib!FEditorBuildUtils::EditorBuild()
UE4Editor-LevelEditor.dylib!TBaseStaticDelegateInstance<void ()>::ExecuteIfSafe()
UE4Editor-Slate.dylib!FUICommandList::ExecuteAction(TSharedRef<FUICommandInfo const,()
UE4Editor-Slate.dylib!SMenuEntryBlock::OnClicked()
UE4Editor-Slate.dylib!SMenuEntryBlock::OnMenuItemButtonClicked()
UE4Editor-Slate.dylib!TBaseSPMethodDelegateInstance<false, SMenuEntryBlock, (ESPMode)0, FReply ()>::Execute()
UE4Editor-Slate.dylib!SButton::OnMouseButtonUp()
UE4Editor-Slate.dylib!SMenuEntryButton::OnMouseButtonUp()
UE4Editor-Slate.dylib!FSlateApplication::RoutePointerUpEvent()
UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseButtonUpEvent()
UE4Editor-Slate.dylib!FSlateApplication::OnMouseUp()
UE4Editor-Core.dylib!FMacApplication::ProcessEvent()
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents()
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!<Unknown>
UE4Editor-Core.dylib!<Unknown>
Foundation!Unknown()
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>

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Fixed
ComponentPlatform - Mac
Affects Versions4.14
Target Fix4.14
Fix Commit3180044
Release Commit3180044
CreatedOct 27, 2016
ResolvedOct 31, 2016
UpdatedApr 27, 2018