Unreal Engine Issues and Bug Tracker (UE-41789)

Description

Using Straighten Connections shortcut can cause the editor to crash after removing node pins. This appears to be due to GetGraphPinForMenu returning the last pin selected (in this case, the removed one).

Workaround:
Opening the right click window clears out the "last pin selected" status.

Suggested Fix:
Licensee mentioned clearing SGraphEditorImpl::GraphPinForMenu after pin context menus are closed prevents crash from occurring.

Repro Rate:
7/10

Steps to Reproduce

Open UE4 Editor (any project)
Open Editor Preferences->General->KeyBoard Shortcuts
Set Graph Editor->Straighten Connection(s) shortcut
Add blueprint based on actor
In Event Graph, add Make Array node
Add additional element pins
Right click on an element pin and select "Remove Array Element Pin"
Rapidly Press "Straighten Connection(s)" shortcut key while quickly moving the mouse across the screen

Result:
Editor will crash when the shortcut key is used

Expected:
Connected/selected nodes have their wires straightened with no crash

Callstack

Assertion failed: OwningNode [File:D:\Build\++UE4+Release-4.14+Compile\Sync\Engine\Source\Runtime\Engine\Classes\EdGraph/EdGraphPin.h] [Line: 403] 



KERNELBASE.dll
UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:103]
UE4Editor-Core.dll!FOutputDevice::Logf__VA() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:68]
UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor-GraphEditor.dll!SGraphPanel::StraightenConnections() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\grapheditor\private\sgraphpanel.cpp:1280]
UE4Editor-Kismet.dll!SGraphEditor::StraightenConnections() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\public\grapheditor.h:360]
UE4Editor-Kismet.dll!FBlueprintEditor::OnStraightenConnections() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\kismet\private\blueprinteditor.cpp:5259]
UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:318]
UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:424]
UE4Editor-Slate.dll!FUICommandList::ConditionalProcessCommandBindings() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:211]
UE4Editor-Slate.dll!FUICommandList::ProcessCommandBindings() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:155]
UE4Editor-GraphEditor.dll!SGraphEditorImpl::OnKeyDown() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\grapheditor\private\sgrapheditorimpl.cpp:66]
UE4Editor-Slate.dll!<lambda_2afcd964c763e269e2d1a63f3a72f846>::operator()() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4626]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_2afcd964c763e269e2d1a63f3a72f846> >() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor-Slate.dll!FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_2afcd964c763e269e2d1a63f3a72f846>,FKeyEvent>() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:197]
UE4Editor-Slate.dll!FSlateApplication::ProcessKeyDownEvent() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4624]
UE4Editor-Slate.dll!FSlateApplication::OnKeyDown() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4539]
UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1487]
UE4Editor-Core.dll!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2071]
UE4Editor-Core.dll!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:814]
UE4Editor-Core.dll!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:678]
USER32.dll
USER32.dll
UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:951]
UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2811]
UE4Editor.exe!GuardedMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor.exe!WinMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32.dll
ntdll.dll
ntdll.dll

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Fixed

Component	UE - Gameplay - Blueprint
Affects Versions	4.14.3, 4.15
Target Fix	4.16

Fix Commit	3308097
Main Commit	3358685

Created	Feb 8, 2017
Resolved	Feb 16, 2017
Updated	Jul 26, 2018

Pull Requests

3236 - projectgheist

View Jira Issue

UE-41789

Editor crash when using Straighten Connection shortcut key

Editor crash when using Straighten Connection shortcut key

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