Description

Please review crash report from EPS case.

repro project attached

[Link Removed]

Steps to Reproduce
  1. Create a component blueprint of type 'MyComponent'
  2. Create a widget of base class 'MyTestWidget'
  3. In the newly created widget, try to add the blueprint component, compile and save the widget.
  4. Try to add another component, it should crash after clicking on the + icon.
Callstack
[Inlined] UE::Logging::Private::BasicFatalLogV::__l2::<lambda_1>::operator()() StructuredLog.cpp:1708
[Inlined] UE::Logging::Private::BasicFatalLogV(const UE::Logging::Private::FStaticBasicLogRecord &, void *, char *) StructuredLog.cpp:1708
UE::Logging::Private::BasicFatalLog(const UE::Logging::Private::FStaticBasicLogRecord &,const FLogCategoryBase *,...) StructuredLog.cpp:1718
StaticAllocateObjectErrorTests(const UClass *, UObject *, FName, EObjectFlags) UObjectGlobals.cpp:3521
StaticAllocateObject(const UClass *, UObject *, FName, EObjectFlags, EInternalObjectFlags, bool, bool *, UPackage *, int, FRemoteObjectId, FGCReconstructionGuard *) UObjectGlobals.cpp:3674
StaticConstructObject_Internal(const FStaticConstructObjectParameters &) UObjectGlobals.cpp:5038
StaticDuplicateObjectEx(FObjectDuplicationParameters &) UObjectGlobals.cpp:3251
FObjectPropertyBase::ImportText_Internal(const wchar_t *, void *, EPropertyPointerType, UObject *, int, FOutputDevice *) PropertyBaseObject.cpp:478
FObjectProperty::ImportText_Internal(const wchar_t *, void *, EPropertyPointerType, UObject *, int, FOutputDevice *) PropertyObject.cpp:405
FArrayProperty::ImportTextInnerItem(const wchar_t *, const FProperty *, void *, int, UObject *, FScriptArrayHelper *, FOutputDevice *) PropertyArray.cpp:1081
FArrayProperty::ImportText_Internal(const wchar_t *, void *, EPropertyPointerType, UObject *, int, FOutputDevice *) PropertyArray.cpp:1029
PropertyPathHelpersInternal::SetPropertyValueFromString<…>(void *, const FCachedPropertyPath &, const FString &, unsigned int) PropertyPathHelpers.cpp:362
PropertyPathHelpersInternal::TPropertyPathResolver::Resolve(void *, const FCachedPropertyPath &) PropertyPathHelpers.h:681
PropertyPathHelpersInternal::IteratePropertyPathRecursive<…>(UStruct *, void *, int, const FCachedPropertyPath &, PropertyPathHelpersInternal::FPropertyPathResolver &) PropertyPathHelpers.cpp:42
PropertyPathHelpersInternal::IteratePropertyPathRecursive<…>(UStruct *, UObject *, int, const FCachedPropertyPath &, PropertyPathHelpersInternal::FPropertyPathResolver &) PropertyPathHelpers.cpp:98
PropertyPathHelpersInternal::ResolvePropertyPath(UObject *, const FCachedPropertyPath &, PropertyPathHelpersInternal::FPropertyPathResolver &) PropertyPathHelpers.cpp:538
PropertyPathHelpers::SetPropertyValueFromString(UObject *, const FCachedPropertyPath &, const FString &, unsigned int) PropertyPathHelpers.cpp:1259
PropagateDefaultPropertyChange(const FPropertyChangedEvent &, const FEditPropertyChain &, UObject *, UObject *) WidgetBlueprintEditor.cpp:1202
FWidgetBlueprintEditor::MigrateFromChain(const FPropertyChangedEvent *, FEditPropertyChain *, bool) WidgetBlueprintEditor.cpp:1270
SWidgetDetailsView::NotifyPostChange(const FPropertyChangedEvent &, FEditPropertyChain *) SWidgetDetailsView.cpp:675
FPropertyNode::NotifyPostChange(FPropertyChangedEvent &, FNotifyHook *) PropertyNode.cpp:3437
FPropertyValueImpl::AddChild() PropertyHandleImpl.cpp:1433
FPropertyHandleArray::AddItem() PropertyHandleImpl.cpp:5415
FPropertyEditor::OnAddItem() PropertyEditor.cpp:240
[Inlined] Invoke(void (FPropertyEditor::*)(), FPropertyEditor *&) Invoke.h:66
[Inlined] UE::Core::Private::Tuple::TTupleBase::ApplyAfter(void (FPropertyEditor::*&)(), FPropertyEditor *&) Tuple.h:326
TBaseSPMethodDelegateInstance::ExecuteIfSafe() DelegateInstancesImpl.h:325
[Inlined] TDelegate::ExecuteIfBound() DelegateSignatureImpl.inl:631
SDetailsViewBase::Tick(const FGeometry &, const double, const float) SDetailsViewBase.cpp:1281
SWidget::Paint(const FPaintArgs &, const FGeometry &, const FSlateRect &, FSlateWindowElementList &, int, const FWidgetStyle &, bool) SWidget.cpp:1445
SPanel::PaintArrangedChildren(const FPaintArgs &, const FArrangedChildren &, const FGeometry &, const FSlateRect &, FSlateWindowElementList &, int, const FWidgetStyle &, bool) SPanel.cpp:33
SPanel::OnPaint(const FPaintArgs &, const FGeometry &, const FSlateRect &, FSlateWindowElementList &, int, const FWidgetStyle &, bool) SPanel.cpp:15
[...snip...]

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Unresolved
CreatedJun 24, 2026
UpdatedJun 25, 2026
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