Unreal Engine Issues and Bug Tracker (UE-104327)

Description

When converting a function with a local variable to an event, editor crashes.

Issue does not occur in 4.25, therefore a regression.

Steps to Reproduce

Create a BP function Foo
Add a local variable "Var"
Place a "Set" node to "Var" in the graph and connect it's exec pin
Right click on the function entry node, and convert to event

Results: editor crashes

Expected: function is converted to event, local variables are carried over

Callstack

Assertion failed: OwningNode File:D:\Build&#43;+UE4\Sync\Engine\Source\Runtime\Engine\Classes\EdGraph/EdGraphPin.h [Line: 482]
 
0x00007ff9a2973e49 KERNELBASE.dll!UnknownFunction []
 0x00007ff94a4bc386 UE4Editor-Core.dll!ReportAssert() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1627]
 0x00007ff94a4bfae8 UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78]
 0x00007ff94a1cdd5d UE4Editor-Core.dll!FOutputDevice::LogfImpl() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61]
 0x00007ff94a165615 UE4Editor-Core.dll!AssertFailedImplV() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:102]
 0x00007ff94a1676c0 UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:458]
 0x00007ff9297ca1b5 UE4Editor-Engine.dll!UEdGraphPin::MakeLinkTo() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\EdGraph\EdGraphPin.cpp:461]
 0x00007ff93d2541a5 UE4Editor-UnrealEd.dll!FEdGraphUtilities::ReconnectPinMap() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EdGraphUtilities.cpp:709]
 0x00007ff927dd536a UE4Editor-Kismet.dll!FBlueprintEditor::ConvertFunctionToEvent() [D:\Build\++UE4\Sync\Engine\Source\Editor\Kismet\Private\BlueprintEditor.cpp:6008]
 0x00007ff927dd4327 UE4Editor-Kismet.dll!FBlueprintEditor::ConvertFunctionIfValid() [D:\Build\++UE4\Sync\Engine\Source\Editor\Kismet\Private\BlueprintEditor.cpp:5838]
 0x00007ff927e08d8c UE4Editor-Kismet.dll!FBlueprintEditor::OnConvertFunctionToEvent() [D:\Build\++UE4\Sync\Engine\Source\Editor\Kismet\Private\BlueprintEditor.cpp:5797]
 0x00007ff927ded586 UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(void),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307]
 0x00007ff94c650098 UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:102]
 0x00007ff94c73ee41 UE4Editor-Slate.dll!SMenuEntryBlock::OnClicked() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1058]
 0x00007ff94c745660 UE4Editor-Slate.dll!SMenuEntryBlock::OnMenuItemButtonClicked() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:1018]
 0x00007ff94c71b867 UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
 0x00007ff94c7b85fe UE4Editor-Slate.dll!SButton::ExecuteOnClick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
 0x00007ff94c7d077e UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
 0x00007ff94c746dd5 UE4Editor-Slate.dll!SMenuEntryButton::OnMouseButtonUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SMenuEntryBlock.cpp:386]
 0x00007ff94c6146be UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378]
 0x00007ff94c697f54 UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4815]
 0x00007ff94c680367 UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5356]
 0x00007ff94c673642 UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5321]
 0x00007ff96a83bca5 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2174]
 0x00007ff96a829197 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2638]
 0x00007ff96a83e379 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1042]
 0x00007ff96a824310 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:874]
 0x00007ff9a3e3e858 USER32.dll!UnknownFunction []
 0x00007ff9a3e3e299 USER32.dll!UnknownFunction []
 0x00007ff96a83f904 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
 0x00007ff7fed087e7 UE4Editor.exe!FEngineLoop::Tick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4746]
 0x00007ff7fed2113c UE4Editor.exe!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
 0x00007ff7fed2121a UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
 0x00007ff7fed3527d UE4Editor.exe!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
 0x00007ff7fed37faa UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
 0x00007ff9a3187034 KERNEL32.DLL!UnknownFunction []
 0x00007ff9a4f9cec1 ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.26, 5.0-m4
Target Fix	4.26.1

Fix Commit	14900251
Release Commit	14900251

Created	Dec 9, 2020
Resolved	Dec 10, 2020
Updated	Apr 27, 2021

View Jira Issue

UE-104327

Converting a function with local variables to an event crashes editor

Converting a function with local variables to an event crashes editor

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