Unreal Engine Issues and Bug Tracker (UE-50159)

Description

REGRESSION: No, occurs in 4.17 (doesn't repro in 4.16 because orphaned pins wasn't a feature)

Crash occurs when the user attempts to use a struct containing a deleted struct in a blueprint.

Steps to Reproduce

Open QAGame in editor.
Create two structs named Inner and Outer.
Open the Outer struct and set the member variable to Inner struct.
Create and open an actor blueprint.
Add two Make Outer struct nodes.
On one of the Make nodes, split the output pin twice (will expose a bool pin).
On the other Make node, splits the input pin once (will also expose a bool pin).
Link the two bools together.
Compile.
Close blueprint and save all three assets.
Force Delete the Inner struct asset.
Right-click the blueprint and select Reload.
Open the blueprint.
Wire the struct output to a Set-By-Ref node (or anything that gets executed).
Connect the Set-By-Ref node to Event Begin Play.
Compile.

RESULT

Crash

Callstack

Assertion failed: !PinRef->bWasTrashed [File:E:\Release\Engine\Source\Runtime\Engine\Private\EdGraph\EdGraphPin.cpp] [Line: 1718] 

KERNELBASE.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsErrorOutputDevice::Serialize() [e:\release\engine\source\runtime\applicationcore\private\windows\windowserroroutputdevice.cpp:65]
UE4Editor-Core.dll!FOutputDevice::Logf__VA() [e:\release\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
UE4Editor-Core.dll!FDebug::AssertFailed() [e:\release\engine\source\runtime\core\private\misc\assertionmacros.cpp:409]
UE4Editor-Engine.dll!UEdGraphPin::SerializePin() [e:\release\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1719]
UE4Editor-Engine.dll!UEdGraphPin::Serialize() [e:\release\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1497]
UE4Editor-Engine.dll!UEdGraphPin::SerializePin() [e:\release\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1827]
UE4Editor-Engine.dll!UEdGraphPin::SerializePinArray() [e:\release\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1663]
UE4Editor-Engine.dll!UEdGraphNode::Serialize() [e:\release\engine\source\runtime\engine\private\edgraph\edgraphnode.cpp:443]
UE4Editor-BlueprintGraph.dll!UK2Node::Serialize() [e:\release\engine\source\editor\blueprintgraph\private\k2node.cpp:115]
UE4Editor-BlueprintGraph.dll!UK2Node_Variable::Serialize() [e:\release\engine\source\editor\blueprintgraph\private\k2node_variable.cpp:30]
UE4Editor-BlueprintGraph.dll!UK2Node_MakeStruct::Serialize() [e:\release\engine\source\editor\blueprintgraph\private\k2node_makestruct.cpp:358]
UE4Editor-CoreUObject.dll!FArchiveHasReferences::FArchiveHasReferences() [e:\release\engine\source\runtime\coreuobject\private\serialization\archivehasreferences.cpp:46]
UE4Editor-CoreUObject.dll!FArchiveHasReferences::GetAllReferencers() [e:\release\engine\source\runtime\coreuobject\private\serialization\archivehasreferences.cpp:87]
UE4Editor-CoreUObject.dll!FArchiveHasReferences::GetAllReferencers() [e:\release\engine\source\runtime\coreuobject\private\serialization\archivehasreferences.cpp:68]
UE4Editor-UnrealEd.dll!FReplaceReferenceHelper::FindAndReplaceReferences() [e:\release\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:89]
UE4Editor-UnrealEd.dll!FBlueprintCompileReinstancer::ReplaceInstancesOfClass_Inner() [e:\release\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:2025]
UE4Editor-UnrealEd.dll!FBlueprintCompileReinstancer::BatchReplaceInstancesOfClass() [e:\release\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:1474]
UE4Editor-Kismet.dll!FBlueprintCompilationManagerImpl::FlushReinstancingQueueImpl() [e:\release\engine\source\editor\kismet\private\blueprintcompilationmanager.cpp:961]
UE4Editor-Kismet.dll!FBlueprintCompilationManagerImpl::CompileSynchronouslyImpl() [e:\release\engine\source\editor\kismet\private\blueprintcompilationmanager.cpp:194]
UE4Editor-UnrealEd.dll!FKismetEditorUtilities::CompileBlueprint() [e:\release\engine\source\editor\unrealed\private\kismet2\kismet2.cpp:745]
UE4Editor-Kismet.dll!FBlueprintEditor::Compile() [e:\release\engine\source\editor\kismet\private\blueprinteditor.cpp:3193]
UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(void)>::Execute() [e:\release\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(void)>::ExecuteIfSafe() [e:\release\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:434]
UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [e:\release\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
UE4Editor-Slate.dll!SToolBarButtonBlock::OnClicked() [e:\release\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:306]
UE4Editor-Slate.dll!TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64>::operator()<>() [e:\release\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
UE4Editor-Slate.dll!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64> >() [e:\release\engine\source\runtime\core\public\templates\tuple.h:497]
UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void)>::Execute() [e:\release\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor-Slate.dll!TBaseDelegate<FReply>::Execute() [e:\release\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [e:\release\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:282]
UE4Editor-Slate.dll!<lambda_1002768c627006711ef2f351a87ec0e7>::operator()() [e:\release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5254]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [e:\release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:234]
UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [e:\release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5243]
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [e:\release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5745]
UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [e:\release\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5725]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [e:\release\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1725]
UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [e:\release\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2171]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [e:\release\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:888]
UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [e:\release\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:725]
USER32.dll!UnknownFunction []
USER32.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [e:\release\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129]
UE4Editor.exe!FEngineLoop::Tick() [e:\release\engine\source\runtime\launch\private\launchengineloop.cpp:3219]
UE4Editor.exe!GuardedMain() [e:\release\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor.exe!GuardedMainWrapper() [e:\release\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor.exe!WinMain() [e:\release\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32.dll!UnknownFunction []
ntdll.dll!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Gameplay - Blueprint Compiler
Affects Versions	4.17, 4.18
Target Fix	4.18

Fix Commit	3672355
Release Commit	3672355

Created	Sep 21, 2017
Resolved	Sep 29, 2017
Updated	Apr 1, 2019

View Jira Issue

UE-50159

Crash attempting to use a struct containing a deleted struct in a blueprint and compiling

Crash attempting to use a struct containing a deleted struct in a blueprint and compiling

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