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Fixed in 2020.1.X

Fixed in 2018.4.X, 2019.2.X, 2019.3.X



Found in






Issue ID




WorldCollision crashes when spawning particles with World Collision enabled

Visual Effects - Legacy


To reproduce:

1. Download project from the link and open in Unity
2. Open "SampleScene" scene
3. Drag and Drop "ExplosionTomakHighQuality.prefab" into a Scene

Expected Result: Unity Editor successfully plays a Particle System
Actual Result: Unity Editor crashes

- This issue appears on both Windows and macOS
- The Stack trace and link to the Project are shared in the Comments section
- Workaround: As soon as you remove the two Sub Emitter entries from the Parent particle effect the crash disappears

Reproduced on Unity 2018.4.4f1, 2018.4.6f1, 2019.1.14f1, 2019.2.1f1 and 2019.3.0a11
Not reproduced on Unity 2018.3.14f1 and 2018.4.3f1
Regression on Unity 2018.4.4f1

Comments (3)

  1. Hexagonon

    Dec 25, 2019 13:38

    As I sent the issue to you and see you fixed it I am very thankful and happy to use unity further in future.
    So just writing to say Thank you ;)

  2. TSWessel

    Oct 01, 2019 11:13

    2018.4.9f1 is still affected.

    This workaround seems to work for us in the meantime: make sure your sub emitters have a high enough Max Particles setting.


    If you have a particle system with Max Particles set to 5, and it has a sub emitter that spawns 7 particles for each parent particle, then the Max Particles of the sub emitter should be at least 5 × 7 = 35.

  3. playemgames

    Aug 23, 2019 16:07

    I've had this bug since 2019.1.9 for all that are affected.

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