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

View Jira Issue

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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