Unreal Engine Issues and Bug Tracker (UE-51169)

Description

This is a trending Mac crash coming out of the 4.18 previews. Most of the project titles experiencing this crash mention "AR"

It is the exact same callstack and crashgroup as [Link Removed], but that was confirmed to have been fixed in the 4.16.2, and this has only just resurfaced in 4.18.

User Descriptions

was trying to launch ARSample on my iPhone 7+, shaders will still compiling if it matters.

Steps to Reproduce

repro steps currently unknown

Callstack

SEGV_NOOP at 0x0

UE4Editor-SlateCore.dylib!SWindow::IsVisible() 
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::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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Duplicate

Component	UE - Platform - Apple
Affects Versions	4.18

Created	Oct 12, 2017
Resolved	Oct 13, 2017
Updated	Apr 27, 2018

UE-51169

[CrashReport] Mac crash - UE4Editor-SlateCore.dylib!SWindow::IsVisible()

[CrashReport] Mac crash - UE4Editor-SlateCore.dylib!SWindow::IsVisible()

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