Unreal Engine Issues and Bug Tracker (UE-33859)

Description

User will hit an ensure first when pasting a copied custom event, and will crash after compiling.

Steps to Reproduce

Create a new Blueprint Class Actor named Foo
Create a new Blueprint Class Actor named Bar
In BP Foo create a Custom Event node named MyEvent
Drag off the Event MyEvent and add a print string
Create a 1 Key Event
Drag off the 1 Key event and add the function MyEvent
Drag off the Function MyEvent and create a print string
Select all the nodes and copy / paste them into event graph of Bar
- User receives an ensure [Link Removed]
- The Function MyEvent is not created
Drag off the Event 1 key Event and add the function MyEvent
Select Compile

Result: Editor crashes instantly
Expected: Blueprint compiles

Callstack

MachineId:664A3B6E473BADAB41AE90B4A8B67613
EpicAccountId:07730bcdd79045f3931f8c6be898df40

Assertion failed: !PinRef->bWasTrashed [File:D:\Builds\UE4_Dev-Main\Engine\Source\Runtime\Engine\Private\EdGraph\EdGraphPin.cpp] [Line: 1442] 



UE4Editor_Core!FDebug::AssertFailed() [d:\builds\ue4_dev-main\engine\source\runtime\core\private\misc\outputdevice.cpp:421]
UE4Editor_Engine!UEdGraphPin::SerializePin() [d:\builds\ue4_dev-main\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1443]
UE4Editor_Engine!UEdGraphPin::SerializePinArray() [d:\builds\ue4_dev-main\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1393]
UE4Editor_Engine!UEdGraphPin::Serialize() [d:\builds\ue4_dev-main\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1252]
UE4Editor_Engine!UEdGraphPin::SerializePin() [d:\builds\ue4_dev-main\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1535]
UE4Editor_Engine!UEdGraphPin::SerializePinArray() [d:\builds\ue4_dev-main\engine\source\runtime\engine\private\edgraph\edgraphpin.cpp:1393]
UE4Editor_Engine!UEdGraphNode::Serialize() [d:\builds\ue4_dev-main\engine\source\runtime\engine\private\edgraph\edgraphnode.cpp:325]
UE4Editor_BlueprintGraph!UK2Node_CallFunction::Serialize() [d:\builds\ue4_dev-main\engine\source\editor\blueprintgraph\private\k2node_callfunction.cpp:1819]
UE4Editor_CoreUObject!FFindReferencersArchive::ResetPotentialReferencer() [d:\builds\ue4_dev-main\engine\source\runtime\coreuobject\private\serialization\findreferencersarchive.cpp:88]
UE4Editor_UnrealEd!TFindObjectReferencers<UObject>::TFindObjectReferencers<UObject>() [d:\builds\ue4_dev-main\engine\source\runtime\coreuobject\public\serialization\archiveuobject.h:562]
UE4Editor_UnrealEd!FReplaceReferenceHelper::FindAndReplaceReferences() [d:\builds\ue4_dev-main\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:65]
UE4Editor_UnrealEd!FBlueprintCompileReinstancer::FinalizeFastReinstancing() [d:\builds\ue4_dev-main\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:511]
UE4Editor_UnrealEd!FReinstanceFinalizer::Finalize() [d:\builds\ue4_dev-main\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:462]
UE4Editor_UnrealEd!FBlueprintCompileReinstancer::ReinstanceObjects() [d:\builds\ue4_dev-main\engine\source\editor\unrealed\private\kismet2\kismetreinstanceutilities.cpp:749]
UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() [d:\builds\ue4_dev-main\engine\source\editor\unrealed\private\kismet2\kismet2.cpp:793]
UE4Editor_Kismet!FBlueprintEditor::Compile() [d:\builds\ue4_dev-main\engine\source\editor\kismet\private\blueprinteditor.cpp:3213]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\builds\ue4_dev-main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:317]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(void)>::ExecuteIfSafe() [d:\builds\ue4_dev-main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:423]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:92]
UE4Editor_Slate!SToolBarButtonBlock::OnClicked() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:300]
UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64>::operator()<>() [d:\builds\ue4_dev-main\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:161]
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply (__cdecl SToolBarButtonBlock::*)(void) __ptr64> >() [d:\builds\ue4_dev-main\engine\source\runtime\core\public\delegates\tuple.h:115]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void)>::Execute() [d:\builds\ue4_dev-main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:317]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\builds\ue4_dev-main\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:521]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:278]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4890]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4879]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5337]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\builds\ue4_dev-main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5317]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\builds\ue4_dev-main\engine\source\runtime\core\private\windows\windowsapplication.cpp:1584]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\builds\ue4_dev-main\engine\source\runtime\core\private\windows\windowsapplication.cpp:1930]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\builds\ue4_dev-main\engine\source\runtime\core\private\windows\windowsapplication.cpp:747]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\builds\ue4_dev-main\engine\source\runtime\core\private\windows\windowsapplication.cpp:669]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\builds\ue4_dev-main\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:905]
UE4Editor!FEngineLoop::Tick() [d:\builds\ue4_dev-main\engine\source\runtime\launch\private\launchengineloop.cpp:2788]
UE4Editor!GuardedMain() [d:\builds\ue4_dev-main\engine\source\runtime\launch\private\launch.cpp:156]
UE4Editor!GuardedMainWrapper() [d:\builds\ue4_dev-main\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\builds\ue4_dev-main\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.13, 4.14
Target Fix	4.13

Fix Commit	3072078
Main Commit	3080751
Release Commit	3073319

Created	Jul 28, 2016
Resolved	Aug 1, 2016
Updated	Apr 27, 2018

UE-33859

Editor crashes when selecting compile after copying a Custom event to another blueprint

Editor crashes when selecting compile after copying a Custom event to another blueprint

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