This is a longstanding crash that occurs with low frequency, but has affected over 200 users. One user describes that this occurred while packaging a project, although other users have not provided descriptions to corroborate.

User Descriptions

  • Crash attempting to package non-C++ Unreal 4.15.1 project (BP only, no C++) for Windows 64 on a Windows 10 computer.

Source Context

5185       // Reset the cursor override
 5186       DragDropEvent.GetOperation()->SetCursorOverride( TOptional<EMouseCursor::Type>() );
 5187       }
 5188       else
 5189       {
 5190       // Only fire mouse leave events for widgets inside the captor path, or whoever if there is no captor path.
 5191       if ( MouseCaptorPath.IsValid() == false || MouseCaptorPath.ContainsWidget(SomeWidgetPreviouslyUnderCursor.ToSharedRef()) )
 5192       {
 5193       // Note that the event's pointer position is not translated.
 5194 ***** SomeWidgetPreviouslyUnderCursor->OnMouseLeave(PointerEvent);
 5195       LOG_EVENT(EEventLog::MouseLeave, SomeWidgetPreviouslyUnderCursor);
 5196       }
Steps to Reproduce

repro steps currently unknown

Access violation - code c0000005 (first/second chance not available)

UE4Editor_Slate!FSlateApplication::RoutePointerMoveEvent() [slateapplication.cpp:5195]
UE4Editor_Slate!FSlateApplication::ProcessMouseMoveEvent() [slateapplication.cpp:5653]
UE4Editor_Slate!FSlateApplication::SynthesizeMouseMove() [slateapplication.cpp:3815]
UE4Editor_Slate!FSlateApplication::TickApplication() [slateapplication.cpp:1598]
UE4Editor_Slate!FSlateApplication::Tick() [slateapplication.cpp:1481]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:2894]
UE4Editor!GuardedMain() [launch.cpp:152]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:127]
UE4Editor!WinMain() [launchwindows.cpp:208]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:253]

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Won't Fix
ComponentUE - Editor - UI Systems - Slate
Affects Versions4.
CreatedJun 28, 2017
ResolvedAug 18, 2021
UpdatedAug 18, 2021
View Jira Issue