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[4.7] Play in Editor crashing after compiling certain Blueprints.

Hello all.

Since the 4.7 update, we've been experiencing certain crashes related to the following situations.

  • One Blueprint (a standard Class BP), caused a crash everytime it was compiled

However, it worked perfectly ingame. We fixed this by duplicating the Blueprint and replacing all the references to the old BP with references to the new BP.

  • A set of Blueprints (our custom Player Controller, our custom HUD Blueprint, and all of our Widget Blueprints) cause a crash if we compile them and THEN try to Play in Editor.

Playing in Standalone Mode works correctly. Restarting the project causes Play in Editor to work correctly as well. But if we compile any of them and then Play in Editor, it causes a crash. Duplicating these Blueprints and replacing their references does not seem to work (the new ones cause a crash as well, perhaps because they reference each other, even though there are absolutely zero circular reference scenarios).

-In all these crashes, the error message is exactly the same:

alt text

If there is any further information I can provide or steps I can take to help the support team, I'm glad to try and do so.

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asked Mar 09 '15 at 02:59 PM in Bug Reports

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Well, I found a workaround. There were many more "corrupted" blueprints than I initially thought. Duplicating all these blueprints and re-referencing everything seemed to solve the issue.

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answered Mar 09 '15 at 08:22 PM

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avatar image TJ V ♦♦ STAFF Mar 09 '15 at 10:00 PM

Hi IMC.Wander,

I'm glad you got it working properly. If you would like to continue to investigate this issue though, please keep reading. If not, it's no problem.

Did you submit that crash report? The only crash I could find in the system was for a launcher crash a few days ago. This could be due to how slow our crash reporter site can sometimes be (especially with the rate that we are currently getting crash reports).

If you still have access to it, could you post the entire call stack in text from that crash? Also any Log files could help as well. You can find more info on where to find the logs in the link below.


avatar image IMC.Wander Mar 09 '15 at 11:00 PM

Of course. I'll do my best to cooperate with you to help solve this bug tomorrow first thing in the morning. It would be easy to reproduce the crash as I am 99% positive I have pre-fix backups of my project.

I did send several crash reports though.

Thank you for your answer, TJ.

avatar image IMC.Wander Mar 10 '15 at 12:49 PM

Okey, here we go. I will post the two differentiated issues, one for the Blueprint which crashes on compile, and another for one of the Blueprints which crash after compiling and then hitting Play in Editor. I include a .rar with all the data I could find for each case, plus an example Blueprint for each as well.

Blueprint crashing on compile


Blueprint crashing on compile then Play in Editor


Hope this helps

avatar image TJ V ♦♦ STAFF Mar 10 '15 at 08:32 PM

Thanks for all of the info! I'm unsure of what caused the blueprint to become corrupted but we now have several crash reports showing in our system. That should give us a good start if this happens again or if another user experiences it.

Thanks again,


avatar image IMC.Wander Mar 10 '15 at 11:29 PM

My pleasure!

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