Unreal Engine Issues and Bug Tracker (UE-92787)

Description

REGRESSION: Does not occur in 4.24

Crash occurs when saving a blueprint that is using a Get Float Attribute node and the Attribute pin is set inline.

Does not occur if the pin is connected.

Steps to Reproduce

Open a project with the Ability System plugin enabled (or enabled it in a project)
- ActionRPG, for example.
Open a blueprint.
Add a Get Float Attribute node to the graph.
Change the Attribute to some other than None (must be set inline for crash to occur)
Compile and save.

RESULT

Crash

Callstack

Fatal error: [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/CoreUObject/Private/UObject/UObjectGlobals.cpp] [Line: 291] 
Illegal call to StaticFindObjectFast() while serializing object data or garbage collecting!


KERNELBASE.dll!UnknownFunction []
UE4Editor-Core.dll!ReportAssert() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1451]
UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61]
UE4Editor-CoreUObject.dll!StaticFindObjectFast() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:295]
UE4Editor-CoreUObject.dll!FFieldPath::TryToResolveOwnerFromStruct() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\FieldPath.cpp:223]
UE4Editor-CoreUObject.dll!FFieldPath::Generate() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\FieldPath.cpp:152]
UE4Editor-CoreUObject.dll!FFieldPathProperty::ImportText_Internal() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\FieldPathProperty.cpp:157]
UE4Editor-CoreUObject.dll!FProperty::ImportText() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UnrealType.h:339]
UE4Editor-CoreUObject.dll!FProperty::ImportSingleProperty() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Property.cpp:1451]
UE4Editor-CoreUObject.dll!UScriptStruct::ImportText() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:2792]
UE4Editor-CoreUObject.dll!UScriptStruct::ImportText() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:2767]
UE4Editor-BlueprintGraph.dll!UK2Node::FixupPinStringDataReferences() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\BlueprintGraph\Private\K2Node.cpp:211]
UE4Editor-BlueprintGraph.dll!UK2Node::Serialize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\BlueprintGraph\Private\K2Node.cpp:103]
UE4Editor-BlueprintGraph.dll!UK2Node_CallFunction::Serialize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\BlueprintGraph\Private\K2Node_CallFunction.cpp:2120]
UE4Editor-CoreUObject.dll!FArchiveSaveTagExports::ProcessTaggedObjects() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp:881]
UE4Editor-CoreUObject.dll!FPackageExportTagger::TagPackageExports() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp:2624]
UE4Editor-CoreUObject.dll!UPackage::Save() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp:3599]
UE4Editor-UnrealEd.dll!UEditorEngine::Save() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:4511]
UE4Editor-UnrealEd.dll!UEditorEngine::SavePackage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:4523]
UE4Editor-UnrealEd.dll!UEditorEngine::Exec_Obj() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:4576]
UE4Editor-UnrealEd.dll!UEditorEngine::Exec() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\EditorServer.cpp:5674]
UE4Editor-UnrealEd.dll!UUnrealEdEngine::Exec() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdSrv.cpp:697]
UE4Editor-UnrealEd.dll!InternalSavePackage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\FileHelpers.cpp:3081]
UE4Editor-UnrealEd.dll!InternalPromptForCheckoutAndSave() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\FileHelpers.cpp:3595]
UE4Editor-UnrealEd.dll!FEditorFileUtils::PromptForCheckoutAndSave() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\FileHelpers.cpp:3865]
UE4Editor-UnrealEd.dll!FAssetEditorToolkit::SaveAsset_Execute() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\Toolkits\AssetEditorToolkit.cpp:564]
UE4Editor-UnrealEd.dll!TBaseSPMethodDelegateInstance<0,FAssetEditorToolkit,0,void __cdecl(void)>::ExecuteIfSafe() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:374]
UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:102]
UE4Editor-Slate.dll!SToolBarButtonBlock::OnClicked() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SToolBarButtonBlock.cpp:302]
UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void)>::Execute() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:298]
UE4Editor-Slate.dll!SButton::ExecuteOnClick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:372]
UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4675]
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5198]
UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5166]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2133]
UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2585]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1809]
UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:852]
USER32.dll!UnknownFunction []
USER32.dll!UnknownFunction []
InkObj.dll!UnknownFunction []
atlthunk.dll!UnknownFunction []
USER32.dll!UnknownFunction []
USER32.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
UE4Editor.exe!FEngineLoop::Tick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4762]
UE4Editor.exe!GuardedMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor.exe!WinMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Foundation - Core
Affects Versions	4.25
Target Fix	4.25.1

Fix Commit	13212551
Main Commit	14151001
Release Commit	13212551

Created	May 5, 2020
Resolved	May 6, 2020
Updated	Aug 26, 2020

View Jira Issue

UE-92787

Crash saving blueprint with a Get Float Attribute node and the attribute pin is set inline

Crash saving blueprint with a Get Float Attribute node and the attribute pin is set inline

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