Description

This is a common crash affecting Mac users in 4.16, and going back at least to 4.11. This seems to be a continuation of UE-28603, which was closed as cannot repro.

User Descriptions

  • was looking at tutorials, resized the tutorial window..
  • Halfway through the material tutorial, trying to find the pins to connect parameters
  • I was just adjusting the layout, this is the 3rd crash today, I haven't been able to do anything...
  • clicked close
  • sequence editor in 4.14.3

From Log

'/Game/StarterContent/Maps/AINavigation_geo.AINavigation_geo:PersistentLevel.AINavigation_geo'
LogMetal:Display: Shrinking RingBuffer from 1643264 to 1232640 as max. usage is 44288 at frame 71118]
LogMac:Error: appError called: Assertion failed: Assertion failed: Pair != nullptr [File:Runtime/Core/Public/Containers/Map.h] [Line: 457] 

LogCrashTracker: 

]LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x3

LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0x1ff600b  (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0x21f1a2f  (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0x22d26cd  (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0x223893e  (filename not found) [in UE4Editor-Core.dylib]
SWidget::FindChildGeometry(FGeometry const&, TSharedRef<SWidget, (ESPMode)0>) const Address = 0x4579197  (filename not found) [in UE4Editor-SlateCore.dylib]
SScrollBar::OnMouseButtonDown(FGeometry const&, FPointerEvent const&) Address = 0x3e465e4  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::ProcessMouseButtonDownEvent(TSharedPtr<FGenericWindow, (ESPMode)0> const&, FPointerEvent&) Address = 0x3aa9b02  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::OnMouseDown(TSharedPtr<FGenericWindow, (ESPMode)0> const&, EMouseButtons::Type, FVector2D) Address = 0x3b066d6  (filename not found) [in UE4Editor-Slate.dylib]
FMacApplication::ProcessMouseDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow, (ESPMode)0>) Address = 0x21c1b19  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessEvent(FDeferredMacEvent const&) Address = 0x21b804e  (filename not found) [in UE4Editor-Core.dylib]
...
Steps to Reproduce

repro steps currently unknown

Callstack
UE4Editor-SlateCore.dylib!SWidget::FindChildGeometry(FGeometry const&, TSharedRef<SWidget,()
UE4Editor-Slate.dylib!SScrollBar::OnMouseButtonDown()
UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseButtonDownEvent(TSharedPtr<FGenericWindow,()
UE4Editor-Slate.dylib!FSlateApplication::OnMouseDown(TSharedPtr<FGenericWindow,()
UE4Editor-Core.dylib!FMacApplication::ProcessMouseDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow,()
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>

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-47556 in the post.

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Backlogged
ComponentTools - Slate
Affects Versions4.114.124.144.154.164.174.184.194.22
CreatedJul 20, 2017
UpdatedMay 31, 2019