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Pinning the particles system data-block causes error
Closed, ResolvedPublic


System Information
Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 455 OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.9.26

Blender Version
Broken: version: 2.81 (sub 0), branch: master, commit date: 2019-07-30 20:50, hash: rB5359b7a03307
Worked: 2.79b

Exact steps for others to reproduce the error

  • Add a Particles System to the default Cube
  • Click the "Pin" icon above (keep current data-block displayed)
  • Delete the Lamp or move the Cube
in.Traceback (most recent call last):
  File "/", line 275, in draw
    col.prop(psys, "seed")
TypeError: UILayout.prop(): error with argument 1, "data" - does not support a 'None' assignment AnyType type

location: <unknown location>:-1

Also, most of the Emission settings are hidden when the data-block is pinned.