Description

This is a slightly common crash in 4.17. In all cases, the crash appears to occur before a project is launched. Users have not provided any description of their actions when the crash occurs.

Source Context

 2938       void FSlateApplication::GeneratePathToWidgetChecked( TSharedRef< const SWidget > InWidget, FWidgetPath& OutWidgetPath, EVisibility VisibilityFilter ) const
 2939       {
 2940       	if ( !FSlateWindowHelper::FindPathToWidget(SlateWindows, InWidget, OutWidgetPath, VisibilityFilter) )
 2941       	{
 2942       		const bool bWasFound = FSlateWindowHelper::FindPathToWidget(SlateVirtualWindows, InWidget, OutWidgetPath, VisibilityFilter);
 2943 ***** 		check(bWasFound);
 2944       	}
 2945       }
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: bWasFound [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp] [Line: 2944]

UE4Editor_Slate!FSlateApplication::GeneratePathToWidgetChecked() [slateapplication.cpp:2944]
UE4Editor_Slate!FSlateApplication::AddModalWindow() [slateapplication.cpp:2026]
UE4Editor_UnrealEd!UEditorEngine::EditorAddModalWindow() [editorengine.cpp:3845]
UE4Editor_UnrealEd!SOutputLogDialog::Open() [soutputlogdialog.cpp:45]
UE4Editor_GameProjectGeneration!GameProjectUtils::BuildCodeProject() [gameprojectutils.cpp:2040]
UE4Editor_GameProjectGeneration!SNewProjectWizard::CreateAndOpenProject() [snewprojectwizard.cpp:1496]
UE4Editor_GameProjectGeneration!TBaseSPMethodDelegateInstance<0,SNewProjectWizard,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_AppFramework!SWizard::HandleFinishButtonClicked() [swizard.cpp:287]
UE4Editor_AppFramework!TMemberFunctionCaller<SWizard,FReply() [delegateinstanceinterface.h:165]
UE4Editor_AppFramework!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SWizard,FReply() [tuple.h:497]
UE4Editor_AppFramework!TBaseSPMethodDelegateInstance<0,SWizard,0,FReply __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5199]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:232]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5188]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5690]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5670]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1718]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151]
UE4Editor!GuardedMain() [launch.cpp:166]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134]
UE4Editor!WinMain() [launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:253]
kernel32!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()

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Cannot Reproduce
ComponentTools - Slate
Affects Versions4.17
CreatedSep 7, 2017
ResolvedJun 4, 2018
UpdatedFeb 7, 2020