This is an intermittent crash occurring in the 4.17 release. Users have not provided any descriptions of their actions when the crash occurred.
The callstack is similar to [Link Removed], fixed in 4.15.
repro steps currently unknown
Assertion failed: IsValid() [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Core\Public\Templates/SharedPointer.h] [Line: 824] UE4Editor_PropertyEditor!FDetailCategoryImpl::GetParentLayout() [detailcategorybuilderimpl.h:166] UE4Editor_PropertyEditor!FDetailPropertyRow::GetPropertyUtilities() [detailpropertyrow.cpp:178] UE4Editor_PropertyEditor!FDetailPropertyRow::MakeValueWidget() [detailpropertyrow.cpp:666] UE4Editor_PropertyEditor!FDetailPropertyRow::GetWidgetRow() [detailpropertyrow.cpp:193] UE4Editor_PropertyEditor!FDetailLayoutCustomization::GetWidgetRow() [detailcategorybuilderimpl.cpp:72] UE4Editor_PropertyEditor!SDetailSingleItemRow::OnContextMenuOpening() [sdetailsingleitemrow.cpp:370] UE4Editor_PropertyEditor!SDetailTableRowBase::OnMouseButtonUp() [sdetailtablerowbase.h:48] UE4Editor_Slate!<lambda_74ecb22bb70e3f50c9d83154dfa5c688>::operator() [slateapplication.cpp:5252] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_74ecb22bb70e3f50c9d83154dfa5c688> >() [slateapplication.cpp:232] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5236] 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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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-48729 in the post.