ID user decrement error, likely related to custom material PointerProperty #62643

New Issue

MACHIN3 · 2019-03-16T11:56:13+01:00

MACHIN3 commented

2019-03-16 11:56:13 +01:00

System Information
Operating system: Linux-4.13.10-041310-generic-x86_64-with-debian-stretch-sid 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.67

Blender Version
Broken: version: 2.80 (sub 49), branch: blender2.7, commit date: 2019-03-15 23:51, hash: 3600bb79d0
Worked: -

Short description of error

Changing any material property on the material of the selected object in the attached blend, causes the terminal to print these errors:

ERROR (bke.library): /home/sources/buildbot-x86_64-slave/linux_glibc224_x86_64_cmake/blender.git/source/blender/blenkernel/intern/library.c:242 id_us_min: ID user decrement error: MAplastic.red (from '[Main]'): 0 <= 0

Interestingly, the error occurs only when the material properties panel is open. so it may be related to the preview icon?

The file was saved with a custom defined PointerProperty, which is currently pointing to the material plastic.red.
You can register the property from the text editor in the blend, but it's not even necessary.
If you do register the property, you can set it to None and the error will be gone.

This error used to be a Warning a while ago.
I've been getting it since at least December, when I started using this PointerProperty.

Exact steps for others to reproduce the error

open the attached blend
change the emission strength in the node editor, watch the terminal
switch to the materials workspace or switch away from the material properties and change the value again, nothing will happen
the blue material has a PointerProperty at material.DM.matchedmaterialto, pointing to the plastic.red material
you can register it by running the script in the text editor, but the error occurs even without it being registered
if registered. set it to None and the error will be gone

Video demo
ID_user_decrement_error.blend

**System Information** Operating system: Linux-4.13.10-041310-generic-x86_64-with-debian-stretch-sid 64 Bits Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.67 **Blender Version** Broken: version: 2.80 (sub 49), branch: blender2.7, commit date: 2019-03-15 23:51, hash: `3600bb79d0` Worked: - **Short description of error** Changing any material property on the material of the selected object in the attached blend, causes the terminal to print these errors: ``` ERROR (bke.library): /home/sources/buildbot-x86_64-slave/linux_glibc224_x86_64_cmake/blender.git/source/blender/blenkernel/intern/library.c:242 id_us_min: ID user decrement error: MAplastic.red (from '[Main]'): 0 <= 0 ``` Interestingly, the error occurs only when the material properties panel is open. so it may be related to the preview icon? The file was saved with a custom defined PointerProperty, which is currently pointing to the material `plastic.red`. You can register the property from the text editor in the blend, but it's not even necessary. If you do register the property, you can set it to None and the error will be gone. This error used to be a Warning a while ago. I've been getting it since at least December, when I started using this PointerProperty. **Exact steps for others to reproduce the error** * open the attached blend * change the emission strength in the node editor, watch the terminal * switch to the materials workspace or switch away from the material properties and change the value again, nothing will happen * the blue material has a PointerProperty at `material.DM.matchedmaterialto`, pointing to the `plastic.red` material * you can register it by running the script in the text editor, but the error occurs even without it being registered * if registered. set it to None and the error will be gone [Video demo ](https://www.youtube.com/watch?v=1eqamzYCVlI) [ID_user_decrement_error.blend](https://archive.blender.org/developer/F6833965/ID_user_decrement_error.blend)

MACHIN3 commented

2019-03-16 11:56:13 +01:00

Added subscriber: @MACHIN3