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Editor Crashed: Access violation after pressing play or compile button

When I pressed the play button or the compile button on my project, then unreal editor was crashed.

Branch: 'Binary' build from the Unreal Launcher

Version: 4.7.6-2513093+++depot+UE4-Releases+4.7

System: Windows 8.1

Reproduce Steps:

  1. Load my project.

  2. Press the play or compile button.

The issue occur very frequently.

The crash log: Crash Log

 Access violation - code c0000005 (first/second chance not available)
 UE4Editor_CoreUObject!UObjectBase::IsValidLowLevelFast() + 118 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\uobjectbase.cpp:306]
 UE4Editor_CoreUObject!FGCCollector::HandleObjectReference() + 83 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:269]
 UE4Editor_Engine!FSimpleObjectReferenceCollectorArchive::operator<<() + 77 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\public\uobject\garbagecollection.h:460]
 UE4Editor_CoreUObject!UObjectProperty::SerializeItem() + 55 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\propertyobject.cpp:32]
 UE4Editor_CoreUObject!UStruct::SerializeBin() + 254 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\class.cpp:715]
 UE4Editor_Engine!UBlueprintGeneratedClass::AddReferencedObjectsInUbergraphFrame() + 744 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\blueprintgeneratedclass.cpp:700]
 UE4Editor_CoreUObject!FArchiveRealtimeGC::ProcessObjectArray() + 7509 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:707]
 UE4Editor_CoreUObject!TGraphTask<FArchiveRealtimeGC::FGCTask>::ExecuteTask() + 453 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\async\taskgraphinterfaces.h:671]
 UE4Editor_Core!FTaskThread::ProcessTasks() + 3125 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\async\taskgraph.cpp:428]
 UE4Editor_Core!FTaskThread::ProcessTasksUntilQuit() + 77 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\async\taskgraph.cpp:271]
 UE4Editor_Core!FTaskThread::Run() + 11 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\async\taskgraph.cpp:562]
 UE4Editor_Core!FRunnableThreadWin::Run() + 102 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:73]
 UE4Editor_Core!FRunnableThreadWin::GuardedRun() + 93 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:26]
 kernel32 + 5074 bytes
 ntdll + 452948 bytes

Product Version: Not Selected
crashlog.txt (2.6 kB)
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asked Apr 26 '15 at 03:31 PM in Bug Reports

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avatar image Adam Davis STAFF Apr 27 '15 at 04:06 PM

Hi HamkenDevelop,

Can you post your dxdiag here so i can take a look? Additionally, does this occur with a clean project with no additional content or is it limited to a specific project?

avatar image HamkenDevelop Apr 28 '15 at 04:05 AM


Thank you for a response.

Dxdiag is here.

And this is a backup log of when the editor crashed.

My project has a lot of additional contents and also a component that made with c++.

avatar image Adam Davis STAFF Apr 28 '15 at 02:49 PM

What was the most recent addition to your project before the crashes began occurring? Have you checked your C++ component code to ensure that it isn't missing any code formatting (semicolons, matching capitalization, etc)?

avatar image HamkenDevelop Apr 29 '15 at 02:57 AM

I added a blueprint component to my project before the crashes began occurring.

I added a c++ component to my project a month ago. At that time the issue did not occur. So I would like to think that there are no missing point in my c++ component.

avatar image Adam Davis STAFF Apr 29 '15 at 02:56 PM

The most likely scenario is that your C++ is fine, I just want to eliminate the easy fixes as I work through to try and limit what the possible bug could be. What is in your blueprint component script?

avatar image HamkenDevelop May 01 '15 at 04:11 AM

What is revealed is that the crash has not occurred after my blueprint component compiled. But the issue occurs again after exiting the editor and reopening my project.

What is my blueprint component:

It is named BP_BuildStage. It acts spawning pawns and ornaments at the game's starting up. It is attached to my game mode class.

My game mode class has have two components.

alt text

One is AutoBuildMap that is c++ component. The other is BP_BuildStage that is blueprint component. The BP_BuildStage access the AutoBuildMap.

This is BP_BuildStage's Event Graph. alt text

gamemode.png (16.2 kB)
bp_buildstage.png (175.8 kB)
avatar image Adam Davis STAFF May 01 '15 at 02:09 PM

I'm going to have you try a few things, to rule out possibilities. The first is, when you close and re-open the editor, try compiling the blueprint(s) before pressing play. Does it crash after doing this?

avatar image HamkenDevelop May 02 '15 at 05:43 AM

When I compile the BP_BuildStage (blueprint component) first, the editor does not crash. Subsequently, pressing the play button and the compile button on the other blueprint does not cause a crash anymore.

When I compile the other blueprint first, the editor crashes.

avatar image Adam Davis STAFF May 04 '15 at 03:03 PM

What does the other blueprint do specifically? Can you show me what is in that event graph?

avatar image HamkenDevelop May 06 '15 at 05:40 AM

I think that they do not especial something.

Additional crash reporting:

After my project loaded, when I exit the editor first, then the editor are crashed.

avatar image Adam Davis STAFF May 06 '15 at 05:10 PM

in this other blueprint, do you have any cast nodes, struct calls, interfaces, or other blueprint communication nodes that you are using?

avatar image HamkenDevelop May 08 '15 at 05:56 AM

I inspected all my blueprints for cast nodes and interface call nodes.

The blueprints list is below.

The Blueprints List

avatar image Adam Davis STAFF May 08 '15 at 02:55 PM

Which other blueprint is the one that crashes the editor specifically? Can you show me the event graph of the blueprint that is causing the crash?

avatar image HamkenDevelop May 10 '15 at 02:57 AM

I added new blueprint that had empty event graph. After reloading my project, pressing the compile button on this blueprint caused the crash. This blueprint is not in communication with another blueprints.

avatar image Adam Davis STAFF May 11 '15 at 04:39 PM

Did you add any components to the blueprint? Can you show me your components viewport and what is in there?

avatar image HamkenDevelop May 12 '15 at 02:17 AM

Nope. I did not add any component to its blueprint. Also, I did not modify it. It is initial setting and is inheriting the Actor class.

avatar image Adam Davis STAFF May 12 '15 at 02:22 PM

If you delete this blueprint do the crashes stop occurring?

avatar image HamkenDevelop May 13 '15 at 05:23 AM

After deleting it, the crash occurred still.

avatar image Adam Davis STAFF May 13 '15 at 01:59 PM

Can you send me a copy of your project? I'll take a look and see what is going on. If you prefer to keep your project private, you can private message me a link to the project on the forums and I'll pull it from there.

avatar image HamkenDevelop May 14 '15 at 07:10 AM

I uploaded my project and sent the private message to you.

avatar image Adam Davis STAFF Jul 16 '15 at 01:13 PM

Hi HamkenDevelop,

One of our developers is attempting to take a look at the project, however it is currently password protected. Can you send me the password used on the zip file again so we can open it and attempt to address the bug?

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1 answer: sort voted first

Hi HamkenDevelop,

I was able to reproduce this and have entered a bug report, UE-15597 to be assessed by the development staff. I found a temporary workaround while this is occurring, however. If when you open the project you disconnect and then reconnect your tick event in your BP_BuildStage component, the project runs and does not crash.

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answered May 14 '15 at 03:28 PM

avatar image HamkenDevelop May 15 '15 at 01:42 AM

Thank you very much!

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