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Fixed in 2020.2.X

Fixed in 2018.4.X, 2019.3.X, 2020.1.X



Found in






Issue ID




'task.rasterData.vertexBuffer == NULL' errors when using a Particle System

Graphics - General


Steps to reproduce:
1. Open User-attached project
2. Run the Sample scene
3. Tab out and wait for at least 3 minutes

Expected: nothing appears in the console
Actual: errors appear in the console

Reproduced in: 2018.4.18f1, 2019.3.0b12, 2019.3.6f1, 2020.1.0b2, 2020.2.0a3
Not reproduced in: 2019.2.21f1, 2019.3.0b11

Notes: Inconsistent reproduction, versions may not be entirely accurate, the bug may appear sooner than 2019.3.0f5, but I have not been able to reproduce it there
RichardK updated notes: Improved first affected versions based on additional information from QA/community

  1. richardkettlewell

    May 07, 2020

    Fixed versions:

  1. Resolution Note (fix version 2020.2):

    Fixed versions:

Comments (36)

  1. sergioagustin

    Apr 27, 2020 11:23

    It happens in 2018.4.21f1

  2. lolaswift

    Apr 23, 2020 11:16

    I'm having the same issue. My version is 2019.3.4f1

  3. slikeytre

    Apr 22, 2020 01:37

    Still getting this in 2019.3.10f1 come on lets not wait for this to hit 15 pages before getting it fixed its been in enough builds already to scream "hey this needs fixed were not crazy"... Particle System + Line Renderer = bug, like everyone already said.

  4. Laious

    Apr 21, 2020 22:59

    This issue is causing errors and crashes to some clients (resulting in returns in Steam). Could really use a fix soon please. I'm using 2019.3.1f1 and I can't simply stop using particles.

  5. Wavefaring

    Apr 21, 2020 16:53


    Thanks! Also I hadn't thought to mention it, but I did test it in both 2020.1 and 2020.2, and this occurs in all versions of those as well.

    Also, I just noticed that the original poster said that this isn't reproducible in 2018.4.19f1 or 2019.3.0f5, but it is following the steps I laid out.

  6. richardkettlewell

    Apr 21, 2020 14:55

    @WAVEFARING that information is really helpful, thank you for sharing it!

  7. Sacristan_G

    Apr 20, 2020 22:14

    Still happening. We are currently holding our game update until this is fixed.

  8. JanusAnderson

    Apr 20, 2020 19:21

    Still happening in 2019.3.10f1.

  9. killpippo

    Apr 20, 2020 18:00

    Registering occasionally this issue since I added particles and line renderer.
    Unity version 2019.3.9f1

    Assertion failed on expression: 'task.rasterData.vertexBuffer == NULL'
    UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

  10. Yany

    Apr 19, 2020 20:35

    2018.4.21f1 is the same. Using Line Renderer.

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