Description

This is a common crash on Mac in the 4.16 release, and has occurred with low frequency since at least 4.11. Users have not provided any descriptions, so additional information is currently unknown. A log file is attached.

Callstack from Log

LogMaterial: Missing cached shader map for material ScotsPine_01_Branches_Mat, compiling. 
Cmd: TRANSACTION UNDO
LogEditorTransaction: Undo Edit Mesh
LogCrashTracker: 

LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x0

LogMac: SWindow::IsVisible() const Address = 0x10daa123 (filename not found) [in UE4Editor-SlateCore.dylib]
PrepassWindowAndChildren(TSharedRef<SWindow, (ESPMode)0>) Address = 0x102f528a (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::DrawPrepass(TSharedPtr<SWindow, (ESPMode)0>) Address = 0x102f4e81 (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::PrivateDrawWindows(TSharedPtr<SWindow, (ESPMode)0>) Address = 0x102f0fc3 (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::DrawWindows() Address = 0x102f0a62 (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::TickApplication(ESlateTickType, float) Address = 0x102f9ffc (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Tick(ESlateTickType) Address = 0x102f7e27 (filename not found) [in UE4Editor-Slate.dylib]
FEngineLoop::Tick() Address = 0x9d0380c  (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0x9d09e12  (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0x9d1801a  (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0x9fafa26  (filename not found) [in UE4Editor-Core.dylib]
__NSThread__start__() Address = 0x773b030d (filename not found) [in Foundation]
_pthread_body() Address = 0x8ac7aaab (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0x8ac7a9f7 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0x8ac7a221 (filename not found) [in libsystem_pthread.dylib]
Steps to Reproduce

repro steps currently unknown. May be related to 'Undo'

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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Fixed
ComponentPlatform - Mac
Affects Versions4.114.154.16
Target Fix4.16.2
Fix Commit3507866
CreatedJun 23, 2017
ResolvedJun 23, 2017
UpdatedApr 27, 2018