This is a trending crash coming out of the 4.18 release. Users have not provided any descriptions of their actions when the crash occurred.
Source Context
367 uint8* FObjectPropertyNode::GetValueBaseAddress( uint8* StartAddress )
368 {
369 uint8* Result = StartAddress;
370
371 UClass* ClassObject;
372 ***** if ( (ClassObject=Cast<UClass>((UObject*)Result)) != NULL )
373 {
374 Result = (uint8*)ClassObject->GetDefaultObject();
375 }
376
377 return Result;
378 }
Update When compiling a newly made widget with the behavior section of the class defaults expanded the editor will crash
Result: The editor will crash after compiling the widget blueprint
Expected: The widget blueprint would be compiled
Access violation - code c0000005 (first/second chance not available) UE4Editor_PropertyEditor!FObjectPropertyNode::GetValueBaseAddress() [objectpropertynode.cpp:373] UE4Editor_PropertyEditor!FItemPropertyNode::GetValueBaseAddress() [itempropertynode.cpp:39] UE4Editor_PropertyEditor!FItemPropertyNode::GetValueAddress() [itempropertynode.cpp:104] UE4Editor_PropertyEditor!FPropertyEditor::IsEditConditionMet() [propertyeditor.cpp:629] UE4Editor_PropertyEditor!SEditConditionWidget::OnGetEditConditionCheckState() [propertyeditorhelpers.cpp:373] UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<1,SEditConditionWidget,0,enum ECheckBoxState __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TAttribute<enum ECheckBoxState>::Get() [attribute.h:137] UE4Editor_Slate!SCheckBox::OnGetCheckImage() [scheckbox.cpp:244] UE4Editor_Slate!TBaseSPMethodDelegateInstance<1,SCheckBox,0,FSlateBrush const * __ptr64 __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TAttribute<FSlateBrush const * __ptr64>::Get() [attribute.h:137] UE4Editor_Slate!SImage::ComputeDesiredSize() [simage.cpp:45] UE4Editor_SlateCore!SWidget::CacheDesiredSize() [swidget.cpp:519] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_SlateCore!SWidget::SlatePrepass() [swidget.cpp:502] UE4Editor_Slate!PrepassWindowAndChildren() [slateapplication.cpp:1343] UE4Editor_Slate!PrepassWindowAndChildren() [slateapplication.cpp:1352] UE4Editor_Slate!FSlateApplication::DrawPrepass() [slateapplication.cpp:1391] UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [slateapplication.cpp:1433] UE4Editor_Slate!FSlateApplication::DrawWindows() [slateapplication.cpp:1190] UE4Editor_Slate!FSlateApplication::TickApplication() [slateapplication.cpp:1777] UE4Editor_Slate!FSlateApplication::Tick() [slateapplication.cpp:1595] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3378] 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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52280 in the post.