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[Bug] Adding EventBeginPlay crashes the editor

This happens in 4.5

It can be reproduced like this:

  1. Create a new blueprint

  2. Add 1 or more graphs to the blueprint.

  3. Add EventBeginPlay to the default event graph

  4. Add EventBeginPlay to one of the created graphs -

  5. And the editor crashes with this error message:

    Assertion failed: NodeToAdd->GetOuter() == this [File:C:\Programs\UE4.5\Engine\Source\Runtime\Engine\Private\EdGraph\EdGraph.cpp] [Line: 129]

    KERNELBASE.dll!UnknownFunction (0x00007ffd1d1d606c) + 0 bytes [UnknownFile:0] UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() (0x00007ffcf6f67c2d) + 0 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95] UE4Editor-Core.dll!FOutputDevice::Logf_VA() (0x00007ffcf6e05878) + 159 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\misc\outputdevice.cpp:145] UE4Editor-Core.dll!FDebug::AssertFailed() (0x00007ffcf6de8632) + 62 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\misc\outputdevice.cpp:220] UE4Editor-Engine.dll!UEdGraph::AddNode() (0x00007ffcf2182ee3) + 0 bytes [c:\programs\ue4.5\engine\source\runtime\engine\private\edgraph\edgraph.cpp:134] UE4Editor-Kismet.dll!FBlueprintActionMenuItem::PerformAction() (0x00007ffcf467d544) + 0 bytes [c:\programs\ue4.5\engine\source\editor\kismet\private\blueprintactionmenuitem.cpp:113] UE4Editor-Kismet.dll!FBlueprintActionMenuItem::PerformAction() (0x00007ffcf467d333) + 0 bytes [c:\programs\ue4.5\engine\source\editor\kismet\private\blueprintactionmenuitem.cpp:152] UE4Editor-Kismet.dll!SBlueprintActionMenu::OnActionSelected() (0x00007ffcf4792bcb) + 0 bytes [c:\programs\ue4.5\engine\source\editor\kismet\private\sblueprintactionmenu.cpp:454] UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance_OneParam ,FDefaultAllocator> const & ptr64,0>::Execute() (0x00007ffcf474f3a8) + 15 bytes [c:\programs\ue4.5\engine\source\runtime\core\public\delegates\delegateinstancesimpl.inl:161] UE4Editor-GraphEditor.dll!SGraphActionMenu::HandleSelection() (0x00007ffceefc5269) + 0 bytes [c:\programs\ue4.5\engine\source\editor\grapheditor\private\sgraphactionmenu.cpp:1160] UE4Editor-GraphEditor.dll!SGraphActionMenu::OnMouseButtonDownEvent() (0x00007ffceeffa575) + 13 bytes [c:\programs\ue4.5\engine\source\editor\grapheditor\private\sgraphactionmenu.cpp:1057] UE4Editor-GraphEditor.dll!TBaseSPMethodDelegateInstance_RetVal_OneParam ,0>::Execute() (0x00007ffceef8e20c) + 42 bytes [c:\programs\ue4.5\engine\source\runtime\core\public\delegates\delegateinstancesimpl.inl:161] UE4Editor-GraphEditor.dll!TBaseDelegate_RetVal_OneParam >::Execute() (0x00007ffceef88ee2) + 36 bytes [c:\programs\ue4.5\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:1058] UE4Editor-GraphEditor.dll!SGraphPaletteItem::OnMouseButtonDown() (0x00007ffceeff9954) + 49 bytes [c:\programs\ue4.5\engine\source\editor\grapheditor\private\sgraphpalette.cpp:87] UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonDownEvent() (0x00007ffcf600d8ef) + 23 bytes [c:\programs\ue4.5\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:3330] UE4Editor-Slate.dll!FSlateApplication::OnMouseDown() (0x00007ffcf5ffaf9b) + 19 bytes [c:\programs\ue4.5\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:3247] UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage() (0x00007ffcf6ee77f2) + 32 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\windows\windowsapplication.cpp:1284] UE4Editor-Core.dll!FWindowsApplication::DeferMessage() (0x00007ffcf6ed3eab) + 74 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\windows\windowsapplication.cpp:1637] UE4Editor-Core.dll!FWindowsApplication::ProcessMessage() (0x00007ffcf6ee8b29) + 41 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\windows\windowsapplication.cpp:737] UE4Editor-Core.dll!FWindowsApplication::AppWndProc() (0x00007ffcf6ed07f2) + 0 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\windows\windowsapplication.cpp:599] USER32.dll!UnknownFunction (0x00007ffd1ecc2434) + 0 bytes [UnknownFile:0] USER32.dll!UnknownFunction (0x00007ffd1ecc2297) + 0 bytes [UnknownFile:0] UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages() (0x00007ffcf6ee8fe6) + 48 bytes [c:\programs\ue4.5\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:757] UE4Editor.exe!FEngineLoop::Tick() (0x00007ff6490e8f22) + 8 bytes [c:\programs\ue4.5\engine\source\runtime\launch\private\launchengineloop.cpp:2111] UE4Editor.exe!GuardedMain() (0x00007ff6490deb0e) + 0 bytes [c:\programs\ue4.5\engine\source\runtime\launch\private\launch.cpp:133] UE4Editor.exe!GuardedMainWrapper() (0x00007ff6490deb7a) + 5 bytes [c:\programs\ue4.5\engine\source\runtime\launch\private\windows\launchwindows.cpp:125] UE4Editor.exe!WinMain() (0x00007ff6490ea6f9) + 17 bytes [c:\programs\ue4.5\engine\source\runtime\launch\private\windows\launchwindows.cpp:201] UE4Editor.exe! _tmainCRTStartup() (0x00007ff6490eb629) + 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618] KERNEL32.DLL!UnknownFunction (0x00007ffd1f2116ad) + 0 bytes [UnknownFile:0] ntdll.dll!UnknownFunction (0x00007ffd1fcd4409) + 0 bytes [UnknownFile:0] ntdll.dll!UnknownFunction (0x00007ffd1fcd4409) + 0 bytes [UnknownFile:0]

Product Version: Not Selected
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asked Oct 08 '14 at 10:46 PM in Bug Reports

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avatar image Rudy Q ♦♦ STAFF Oct 09 '14 at 01:41 PM

Hello serioussam909,

I was unable to reproduce this issue on my end. Does this still occur when you use a clean project? Some other information you could provide would be:

  • dxdiag

  • Log

  • Crash report

This information will help up narrow down the issue.

avatar image serioussam909 Oct 09 '14 at 05:23 PM

Created a blank project - does not occur there.

avatar image Rudy Q ♦♦ STAFF Oct 09 '14 at 08:45 PM

Hello serioussam909,

Since the issue is not occurring in a clean project I would like for you to try it in any other projects that you may have. I would like for you to provide your Log file. This can be found under "YourProjectName"\Saved\Logs. It will be called "YourProjectName".log. I would also like you to provide your dxdiag.

Quick Questions:

  1. When you create an "Event Begin Play" node does it bounce you back to the first instance of the node instead of creating a new one (this is currently what occurs normally)?

  2. Is it happening elsewhere (other projects)?

avatar image serioussam909 Oct 09 '14 at 10:12 PM
  1. It does not bounce me anywhere - it just crashes.

  2. No - just in one project.

hitman.txt (24.7 kB)
dxdiag.txt (61.0 kB)
avatar image Rudy Q ♦♦ STAFF Oct 10 '14 at 02:43 PM

Hello serioussam909,

Thank you for all of your information. This seems to be project specific. If you could send a stripped down version of your project with only the assets needed to reproduce the issue I would be more than happy to try and reproduce it on my end. This will get us another step closer to a possible solution.

avatar image serioussam909 Oct 10 '14 at 05:36 PM

Yes - it is project specific. I deleted Binaries, DerivedDataCache, Intermediate and Saved folders and the editor is not crashing any more.

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1 answer: sort voted first

Hello serioussam909,

Without a version of the project with the crash there is no way for us to reproduce this on our end. I am going to go ahead and mark this as answered. If you are able to reproduce it feel free to send a version with the crash and will be happy to look into it further.

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answered Oct 13 '14 at 01:52 PM

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Rudy Q ♦♦ STAFF
47.7k 545 132 522

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