Unreal Engine Issues

UE-90008

Crash when mousing over array parameter in Blueprint function graph while debugging

Crash when mousing over array parameter in Blueprint function graph while debugging

UDN
Description

Mousing over an array input inside a Blueprint function can lead to a crash. For this to occur, the first parameter of the function must be a User Defined Struct. 

Steps to Reproduce
  • Create a Blueprint function that takes two parameters
    • Param1 is a user defined struct. Default bool value works.
    • Param2 is an array of some type. Confirmed with ints and names
  • Place a breakpoint on the function and call it.
  • PIE
  • Mouse over the array input to Param2 - notice the text representing the data is exported and the tool tip works as expected
  • Step into the function
  • Mouse over the Param2 pin of the function entry node - notice the tool tip does not display the data inside the array
  • This will often lead to a crash and FArrayProperty::ExportTextItem fails to correctly initialize the DefaultArrayHelper
Callstack
UE4Editor-CoreUObject.dll!TProperty_Numeric<int>::GetNumericPropertyValueToString(const void * Data) Line 1472 C++
 UE4Editor-CoreUObject.dll!FNumericProperty::ExportTextItem(FString & ValueStr, const void * PropertyValue, const void * DefaultValue, UObject * Parent, int PortFlags, UObject * ExportRootScope) Line 131 C++
> UE4Editor-CoreUObject.dll!FArrayProperty::ExportTextInnerItem(FString & ValueStr, FProperty * Inner, const void * PropertyValue, int PropertySize, const void * DefaultValue, int DefaultSize, UObject * Parent, int PortFlags, UObject * ExportRootScope) Line 405 C++
 UE4Editor-CoreUObject.dll!FArrayProperty::ExportTextItem(FString & ValueStr, const void * PropertyValue, const void * DefaultValue, UObject * Parent, int PortFlags, UObject * ExportRootScope) Line 381 C++
 UE4Editor-CoreUObject.dll!FProperty::ExportText_Direct(FString & ValueStr, const void * Data, const void * Delta, UObject * Parent, int PortFlags, UObject * ExportRootScope) Line 786 C++
 [Inline Frame] UE4Editor-UnrealEd.dll!FProperty::ExportText_InContainer(int Data, FString & Delta, const void * Parent, const void *) Line 347 C++
 UE4Editor-UnrealEd.dll!FKismetDebugUtilities::GetWatchText(FString & OutWatchText, UBlueprint * Blueprint, UObject * ActiveObject, const UEdGraphPin * WatchPin) Line 1130 C++
 UE4Editor-BlueprintGraph.dll!UK2Node::GetPinHoverText(const UEdGraphPin & Pin, FString & HoverTextOut) Line 1802 C++
 UE4Editor-GraphEditor.dll!SGraphPin::GetTooltipText() Line 1164 C++
 [Inline Frame] UE4Editor-GraphEditor.dll!TMemberFunctionCaller<SGraphPin,FText (__cdecl SGraphPin::*)(void)const>::operator()() Line 156 C++
 [Inline Frame] UE4Editor-GraphEditor.dll!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int>>::ApplyAfter(TMemberFunctionCaller<SGraphPin,FText (__cdecl SGraphPin::*)(void)const> &&) Line 285 C++
 UE4Editor-GraphEditor.dll!TBaseSPMethodDelegateInstance<1,SGraphPin,0,FText __cdecl(void)>::Execute() Line 298 C++
 [Inline Frame] UE4Editor-Slate.dll!TBaseDelegate<FText>::Execute() Line 586 C++
 UE4Editor-Slate.dll!TAttribute<FText>::Get() Line 137 C++
 UE4Editor-Slate.dll!SToolTip::IsEmpty() Line 87 C++
 UE4Editor-Slate.dll!FSlateUser::UpdateTooltip(const FMenuStack & MenuStack, bool bCanSpawnNewTooltip) Line 1135 C++
 UE4Editor-Slate.dll!FSlateApplication::ProcessMouseMoveEvent(const FPointerEvent & MouseEvent, bool bIsSynthetic) Line 5407 C++
 UE4Editor-Slate.dll!FSlateApplication::OnMouseMove() Line 5354 C++
 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage(const FDeferredWindowsMessage & DeferredMessage) Line 2000 C++
 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage(TSharedPtr<FWindowsWindow,0> & NativeWindow, HWND__ * InHWnd, unsigned int InMessage, unsigned __int64 InWParam, __int64 InLParam, int MouseX, int MouseY, unsigned int RawInputFlags) Line 2414 C++
 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage(HWND__ * hwnd, unsigned int msg, unsigned __int64 wParam, __int64 lParam) Line 1638 C++
 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc(HWND__ * hwnd, unsigned int msg, unsigned __int64 wParam, __int64 lParam) Line 789 C++
 [External Code] 
 UE4Editor-ApplicationCore.dll!FWindowsApplication::PumpMessages(const float TimeDelta) Line 2426 C++
 UE4Editor-Slate.dll!FSlateApplication::TickPlatform(float DeltaTime) Line 1380 C++
 UE4Editor-Slate.dll!FSlateApplication::Tick(ESlateTickType TickType) Line 1356 C++
 UE4Editor-Slate.dll!FSlateApplication::EnterDebuggingMode() Line 3320 C++
 UE4Editor-UnrealEd.dll!FKismetDebugUtilities::AttemptToBreakExecution(UBlueprint * BlueprintObj, const UObject * ActiveObject, const FFrame & StackFrame, const FBlueprintExceptionInfo & Info, UEdGraphNode * NodeStoppedAt, int DebugOpcodeOffset) Line 722 C++
 UE4Editor-UnrealEd.dll!FKismetDebugUtilities::OnScriptException(const UObject * ActiveObject, const FFrame & StackFrame, const FBlueprintExceptionInfo & Info) Line 352 C++
 [Inline Frame] UE4Editor-UnrealEd.dll!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int>>::ApplyAfter(void(*)(const UObject *, const FFrame &, const FBlueprintExceptionInfo &) &) Line 285 C++
 [Inline Frame] UE4Editor-UnrealEd.dll!TBaseStaticDelegateInstance<TTypeWrapper<void> __cdecl(UObject const *,FFrame const &,FBlueprintExceptionInfo const &)>::Execute(const UObject *) Line 806 C++
 UE4Editor-UnrealEd.dll!TBaseStaticDelegateInstance<void __cdecl(UObject const *,FFrame const &,FBlueprintExceptionInfo const &)>::ExecuteIfSafe(const UObject * <Params_0>, const FFrame & <Params_1>, const FBlueprintExceptionInfo & <Params_2>) Line 859 C++
 [Inline Frame] UE4Editor-CoreUObject.dll!TBaseMulticastDelegate<void,UObject const *,FFrame const &,FBlueprintExceptionInfo const &>::Broadcast(const UObject *) Line 1013 C++
 UE4Editor-CoreUObject.dll!FBlueprintCoreDelegates::ThrowScriptException(const UObject * ActiveObject, const FFrame & StackFrame, const FBlueprintExceptionInfo & Info) Line 184 C++
 UE4Editor-CoreUObject.dll!UObject::execBreakpoint(UObject * Context, FFrame & Stack, void * const Z_Param__Result) Line 2195 C++
 [Inline Frame] UE4Editor-CoreUObject.dll!FFrame::Step(UObject *) Line 338 C++
 UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction(UObject * Context, FFrame & Stack, void * const Z_Param__Result) Line 997 C++
 UE4Editor-CoreUObject.dll!ProcessScriptFunction<void (__cdecl*)(UObject *,FFrame &,void *)>(UObject * Context, UFunction * Function, FFrame & Stack, void * const Z_Param__Result, void(*)(UObject *, FFrame &, void *) ExecFtor) Line 828 C++
 UE4Editor-CoreUObject.dll!ProcessLocalFunction(UObject * Context, UFunction * Fn, FFrame & Stack, void * const Z_Param__Result) Line 1058 C++
 [Inline Frame] UE4Editor-CoreUObject.dll!FFrame::Step(UObject *) Line 338 C++
 UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction(UObject * Context, FFrame & Stack, void * const Z_Param__Result) Line 997 C++
 UE4Editor-CoreUObject.dll!ProcessScriptFunction<void (__cdecl*)(UObject *,FFrame &,void *)>(UObject * Context, UFunction * Function, FFrame & Stack, void * const Z_Param__Result, void(*)(UObject *, FFrame &, void *) ExecFtor) Line 828 C++
 UE4Editor-CoreUObject.dll!ProcessLocalFunction(UObject * Context, UFunction * Fn, FFrame & Stack, void * const Z_Param__Result) Line 1058 C++
 [Inline Frame] UE4Editor-CoreUObject.dll!FFrame::Step(UObject *) Line 338 C++
 UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction(UObject * Context, FFrame & Stack, void * const Z_Param__Result) Line 997 C++
 UE4Editor-CoreUObject.dll!UObject::ProcessInternal(UObject * Context, FFrame & Stack, void * const Z_Param__Result) Line 1085 C++
 UE4Editor-CoreUObject.dll!UFunction::Invoke(UObject * Obj, FFrame & Stack, void * const Z_Param__Result) Line 5492 C++
 UE4Editor-CoreUObject.dll!UObject::ProcessEvent(UFunction * Function, void * Parms) Line 1916 C++
 UE4Editor-Engine.dll!AActor::ProcessEvent(UFunction * Function, void * Parameters) Line 797 C++
 UE4Editor-Engine.dll!AActor::BeginPlay() Line 3495 C++
 UE4Editor-Engine.dll!AActor::DispatchBeginPlay(bool bFromLevelStreaming) Line 3409 C++
 UE4Editor-Engine.dll!AWorldSettings::NotifyBeginPlay() Line 246 C++
 UE4Editor-Engine.dll!AGameStateBase::HandleBeginPlay() Line 205 C++
 UE4Editor-Engine.dll!UWorld::BeginPlay() Line 4126 C++
 UE4Editor-Engine.dll!UGameInstance::StartPlayInEditorGameInstance(ULocalPlayer * LocalPlayer, const FGameInstancePIEParameters & Params) Line 465 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::CreateInnerProcessPIEGameInstance(FRequestPlaySessionParams & InParams, const FGameInstancePIEParameters & InPIEParameters, int InPIEInstanceIndex) Line 2778 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::OnLoginPIEComplete_Deferred(int LocalUserNum, bool bWasSuccessful, FString ErrorString, FPieLoginStruct DataStruct) Line 1472 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::CreateNewPlayInEditorInstance(FRequestPlaySessionParams & InRequestParams, const bool bInDedicatedInstance, const EPlayNetMode InNetMode) Line 1711 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::StartPlayInEditorSession(FRequestPlaySessionParams & InRequestParams) Line 2572 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::StartQueuedPlaySessionRequestImpl() Line 1088 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::StartQueuedPlaySessionRequest() Line 1017 C++
 UE4Editor-UnrealEd.dll!UEditorEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 1596 C++
 UE4Editor-UnrealEd.dll!UUnrealEdEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 427 C++
 UE4Editor.exe!FEngineLoop::Tick() Line 4701 C++
 [Inline Frame] UE4Editor.exe!EngineTick() Line 62 C++
 UE4Editor.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 173 C++
 UE4Editor.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow) Line 252 C++
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Fixed
ComponentUE - Gameplay - Blueprint Editor
Affects Versions4.23.1, 4.24.2, 4.25
Target Fix4.25
Fix Commit12117076
Main Commit12113008
Release Commit12117076
CreatedMar 3, 2020
ResolvedMar 10, 2020
UpdatedJun 11, 2021
Pull Requests
8141
View Jira Issue