Description

This is a slightly common Mac crash that has occurred since 4.17.1. Users have not provided any descriptions of their actions when the crash occurred.

Callstack from Log

[2017.10.05-15.00.31:683][305]LogMaterial: Missing cached shader map for material M_CobbleStone_Smooth, compiling. 
[2017.10.05-15.00.31:963][305]Cmd: SELECT NONE
[2017.10.05-15.00.35:904][306]Cmd: QUIT_EDITOR
[2017.10.05-15.00.36:153][306]LogMac: Error: appError called: Assertion failed: Assertion failed: IsValid() [File:Runtime/Core/Public/Templates/SharedPointer.h] [Line: 824] 


[2017.10.05-15.00.36:436][306]LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x3

[2017.10.05-15.00.36:436][306]LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x352225b  (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x373994f  (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0x38201bd  (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x377308e  (filename not found) [in UE4Editor-Core.dylib]
FSlateApplicationBase::Get() Address = 0xb255acd  (filename not found) [in UE4Editor-SlateCore.dylib]
SWindow::RequestDestroyWindow() Address = 0xb28b186  (filename not found) [in UE4Editor-SlateCore.dylib]
FDragDropOperation::~FDragDropOperation() Address = 0xb289399  (filename not found) [in UE4Editor-SlateCore.dylib]
FSlateApplication::~FSlateApplication() Address = 0xa8b7d85  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::~FSlateApplication() Address = 0xa8b966e  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Shutdown(bool) Address = 0xa8b4a01  (filename not found) [in UE4Editor-Slate.dylib]
FEngineLoop::Exit() Address = 0x342462e  (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0x3424c40  (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0x34325d0  (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0x36f5446  (filename not found) [in UE4Editor-Core.dylib]
__NSThread__start__() Address = 0xd09ae8ad (filename not found) [in Foundation]
_pthread_body() Address = 0xe4d5193b (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0xe4d51887 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0xe4d5108d (filename not found) [in libsystem_pthread.dylib]
Steps to Reproduce

repro steps currently unknown

Callstack
SEGV_MAPERR at 0x3

UE4Editor-SlateCore.dylib!FSlateApplicationBase::Get()
UE4Editor-SlateCore.dylib!SWindow::RequestDestroyWindow()
UE4Editor-SlateCore.dylib!FDragDropOperation::~FDragDropOperation()
UE4Editor-Slate.dylib!FSlateApplication::~FSlateApplication()
UE4Editor-Slate.dylib!FSlateApplication::~FSlateApplication()
UE4Editor-Slate.dylib!FSlateApplication::Shutdown()
UE4Editor!FEngineLoop::Exit()
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 Versions4.17.14.17.24.184.19
Target Fix4.20
Fix Commit4097249
Main Commit4124555
Release Commit4097249
CreatedOct 5, 2017
ResolvedMay 29, 2018
UpdatedJun 12, 2018