Unreal Engine Issues

UE-29048

Attached Project Crashes When Attempting to Open Struct

Attached Project Crashes When Attempting to Open Struct

Questions & Answers
Description

The attached project crashes whenever one of the structs is being opened.

This does not occur in 4.10.4, this is a regression.

Found in 4.11 Binary, reproduced in Main CL 2930737.

User information: "The interesting thing about that is if I delete the structs I've made, I can open the Blueprints. If I now build new structs (with new names, the old ones are still used) and change all blueprints I can get it running like in 4.10. but after a restart of the engine everything crashes again as if I've changed nothing."

Steps to Reproduce

1. Migrate the content located here into a new project: [Link Removed]
2. Navigate to Blueprints->Dialogue System
3. Attempt to open the DialogueStructEvent Struct

Result: Editor freezes briefly and then a crash occurs.

Expected: Struct would open without issue

Callstack

Fatal error: [Link Removed] [Line: 131]
UBlueprintGeneratedClass::GetAuthoritativeClass: ClassGeneratedBy is null. class '/Engine/Transient.TRASHCLASS_Dialogue_Text_105'

UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\misc\outputdevice.cpp:430]
UE4Editor_Engine!UBlueprintGeneratedClass::GetAuthoritativeClass() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:131]
UE4Editor_BlueprintGraph!FMemberReference::SetFromField<UFunction>() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\engine\classes\engine\memberreference.h:120]
UE4Editor_BlueprintGraph!FMemberReference::FillSimpleMemberReference<UFunction>() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\engine\classes\engine\memberreference.h:480]
UE4Editor_BlueprintGraph!UEdGraphSchema_K2::ConvertPropertyToPinType() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\edgraphschema_k2.cpp:3375]
UE4Editor_BlueprintGraph!UK2Node_CallFunction::CreatePinsForFunctionCall() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\k2node_callfunction.cpp:879]
UE4Editor_BlueprintGraph!UK2Node_CallFunction::AllocateDefaultPins() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\k2node_callfunction.cpp:605]
UE4Editor_BlueprintGraph!UK2Node::ReallocatePinsDuringReconstruction() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\k2node.cpp:288]
UE4Editor_BlueprintGraph!UK2Node_CallFunction::ReallocatePinsDuringReconstruction() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\k2node_callfunction.cpp:647]
UE4Editor_BlueprintGraph!UK2Node::ReconstructNode() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\k2node.cpp:393]
UE4Editor_BlueprintGraph!UEdGraphSchema_K2::ReconstructNode() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\blueprintgraph\private\edgraphschema_k2.cpp:3971]
UE4Editor_UnrealEd!FBlueprintEditorUtils::RefreshExternalBlueprintDependencyNodes() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\unrealed\private\kismet2\blueprinteditorutils.cpp:547]
UE4Editor_Engine!UBlueprintGeneratedClass::ConditionalRecompileClass() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:213]
UE4Editor_CoreUObject!<lambda_47aca297fbbf71c7b9923e373a8b6de5>::operator()() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:141]
UE4Editor_CoreUObject!FScopedClassDependencyGather::~FScopedClassDependencyGather() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:157]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3959]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4143]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3657]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2781]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2889]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1134]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1258]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2458]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2506]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1997]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1907]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:688]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:426]
UE4Editor_CoreUObject!GetPackageLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linker.cpp:701]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1052]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1258]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2458]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2506]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1997]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1907]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:688]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:426]
UE4Editor_CoreUObject!GetPackageLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linker.cpp:701]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1052]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1258]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2458]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2506]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1997]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1907]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:688]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:426]
UE4Editor_CoreUObject!GetPackageLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linker.cpp:701]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1052]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1258]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2458]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2506]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2213]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1997]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:1907]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:688]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:426]
UE4Editor_CoreUObject!GetPackageLinker() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\linker.cpp:701]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1052]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1258]
UE4Editor_CoreUObject!ResolveName() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:695]
UE4Editor_CoreUObject!StaticLoadObjectInternal() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:782]
UE4Editor_CoreUObject!StaticLoadObject() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:852]
UE4Editor_ContentBrowser!FAssetData::GetAsset() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\assetregistry\public\assetdata.h:218]
UE4Editor_ContentBrowser!SContentBrowser::OnAssetsActivated() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\contentbrowser\private\scontentbrowser.cpp:1748]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,TTypeWrapper<void> __cdecl(TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type)>::Execute() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:321]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl(TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type)>::ExecuteIfSafe() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:428]
UE4Editor_ContentBrowser!TBaseDelegate<void,TArray<FAssetData,FDefaultAllocator> const & __ptr64,enum EAssetTypeActivationMethod::Type>::ExecuteIfBound() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:608]
UE4Editor_ContentBrowser!SAssetView::OnListMouseButtonDoubleClick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\editor\contentbrowser\private\sassetview.cpp:3405]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,TTypeWrapper<void> __cdecl(TSharedPtr<FAssetViewItem,0>)>::Execute() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:321]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl(TSharedPtr<FAssetViewItem,0>)>::ExecuteIfSafe() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:428]
UE4Editor_ContentBrowser!TBaseDelegate<void,TSharedPtr<FAssetViewItem,0> >::ExecuteIfBound() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:608]
UE4Editor_ContentBrowser!SListView<TSharedPtr<FAssetViewItem,0> >::Private_OnItemDoubleClicked() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\slate\public\widgets\views\slistview.h:689]
UE4Editor_ContentBrowser!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonDoubleClick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\slate\public\widgets\views\stablerow.h:264]
UE4Editor_Slate!<lambda_08e3ee0f4d0d0de06083ee3e4a4dc299>::operator()() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4891]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_08e3ee0f4d0d0de06083ee3e4a4dc299> >() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:214]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4889]
UE4Editor_Slate!FSlateApplication::OnMouseDoubleClick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4864]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\windows\windowsapplication.cpp:1357]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\windows\windowsapplication.cpp:1732]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\windows\windowsapplication.cpp:697]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\windows\windowsapplication.cpp:619]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:884]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\launch\private\launchengineloop.cpp:2610]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll
Community References

Existing blueprints crashes engine after converting to 4.11

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Cannot Reproduce
ComponentUE - Gameplay - Blueprint
Affects Versions4.11, 4.12
Target Fix4.12
CreatedApr 4, 2016
ResolvedApr 6, 2016
UpdatedApr 27, 2018
View Jira Issue