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Packaged Build crashing when activating particle system with instanced parameters

Hi, after upgrading to 4.12.2 our packaged build crashes. This happens when activating/enabling a particle system via trigger that uses instanced parameters. I made a blueprint to create a particle volume, initial location and spawn rate gets set by instanced parameters in the construction script of the blueprint. When either activating the particle system by a trigger or enabling the particle emitter, packaged builds crash at this line:

Assertion failed: IsInGameThread() [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Engine\Private\Particles\ParticleComponents.cpp] [Line: 6385]Crash in runnable thread TaskGraphThreadNP 1

I reproduced this error in a clean FirstPersonExample project.

Any help would be appreciated. Thanks

Product Version: UE 4.12
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asked Jun 12 '16 at 05:07 PM in Bug Reports

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avatar image m4d3 Jun 12 '16 at 05:14 PM

here is a screenshot of the blueprint: alt text

instancedcrash.jpg (298.8 kB)
avatar image Sean L ♦♦ STAFF Jun 13 '16 at 02:42 PM


  • Could you please provide the logs from your project's Saved->Logs folder after the crash occurs?

  • Could you please cause the crash again and provide your Machine ID from the Crash Reporter window (if you're getting one) and ensure to hit Send & Close on the report?

  • Have you been able to reproduce this in a clean project?

avatar image m4d3 Jun 14 '16 at 05:00 PM


ill try to provide as much information as possible. Yes, this has been reproduced in a clean FirstpersonExample BP project, but only crashes in a packaged build, not in PIE mode.


Log File is in attachment link text

I can provide the zipped project if needed.

avatar image Sean L ♦♦ STAFF Jun 15 '16 at 08:48 PM

I've attempted to reproduce this issue on our end, but haven't seen a crash occurring.

Could you please create a test project that reproduces this crash, delete the Saved and Intermediate folders from the project directory, zip up the project, and provide a link to Dropbox or attach it to a comment on Answerhub? Here is a link to my forum profile in case you want to PM it to me: https://forums.unrealengine.com/member.php?160394-Sean-Flint

avatar image awilliams1701 Aug 04 '16 at 03:14 AM

I'm affected by this bug too. I was looking forward to putting out a new pre-alpha build last weekend. I've spent the whole week trying to fix it. I finally found the logs for the build and had that exact error. I use a blueprint that creates a particle system that grows or shrinks depending on the size of the box in the blueprint. I've temporarily replaced this particle system with one of a fixed size and the crash is gone. Or that one anyway. Now it crashes on exit. I can live with that. LMAO

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Hey m4d3,

I've been able to reproduce the crash in your project, and have entered a bug report, UE-32147. Thank you for your report.

Have a great day

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answered Jun 17 '16 at 03:42 PM

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Sean L ♦♦ STAFF
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avatar image eyesiah Aug 04 '16 at 09:56 AM

Hello Sean, I'm also experiencing this issue in 4.12. I've searched for UE-32147 in the issue tracker but can't find anything (https://issues.unrealengine.com). Can you provide any updates or perhaps check if that's the correct issue number?

Thanks, Isaac

avatar image Sean L ♦♦ STAFF Aug 04 '16 at 12:35 PM
avatar image eyesiah Aug 05 '16 at 09:28 AM

Awesome, thanks!

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