Bake doesn't work anymore with 4.2 LTS

Coding Python Support
1

I made a complex character scene and tried to bake it with command.

import bpy
sc = bpy.context.scene
bpy.ops.nla.bake(frame_start=sc.frame_start, frame_end=sc.frame_end, step=1, only_selected=False, clear_constraints=True, visual_keying=True, bake_types={'POSE'})

But this results long error which makes very little of sense to me.

Traceback (most recent call last):
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\startup\bl_operators\anim.py", line 308, in execute
    actions = anim_utils.bake_action_objects(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 129, in bake_action_objects
    return iter.send(None)
           ^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 160, in bake_action_objects_iter
    yield tuple(iter.send(None) for iter in iter_all)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 160, in <genexpr>
    yield tuple(iter.send(None) for iter in iter_all)
                ^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 464, in bake_action_iter
    bake_custom_properties(pbone, custom_props=custom_props[name], frame=f, group_name=name)
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 251, in bake_custom_properties
    obj[key] = value
    ~~~^^^^^
TypeError: Cannot assign a 'dict' value to the existing 'bbdObject' Group IDProperty
Error: Python: Traceback (most recent call last):
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\startup\bl_operators\anim.py", line 308, in execute
    actions = anim_utils.bake_action_objects(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 129, in bake_action_objects
    return iter.send(None)
           ^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 160, in bake_action_objects_iter
    yield tuple(iter.send(None) for iter in iter_all)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 160, in <genexpr>
    yield tuple(iter.send(None) for iter in iter_all)
                ^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\Error: Python: Traceback (most recent call last):
  File "C:\Projects\Veleho_ArtFull\WorkingFiles\Pawns\BaseMale01\Animations\idle_1h.blend\Text", line 3, in <module>
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy\ops.py", line 109, in __call__
    ret = _op_call(self.idname_py(), kw)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: Error: Python: Traceback (most recent call last):
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\startup\bl_operators\anim.py", line 308, in execute
    actions = anim_utils.bake_action_objects(
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 129, in bake_action_objects
    return iter.send(None)
           ^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 160, in bake_action_objects_iter
    yield tuple(iter.send(None) for iter in iter_all)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 160, in <genexpr>
    yield tuple(iter.send(None) for iter in iter_all)
                ^^^^^^^^^^^^^^^
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 464, in bake_action_iter
    bake_custom_properties(pbone, custom_props=custom_props[name], frame=f, group_name=name)
  File "C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy_extras\anim_utils.py", line 251, in bake_custom_properties
    obj[key] = value
    ~~~^^^^^
TypeError: Cannot assign a 'dict' value to the existing 'bbdObject' Group IDProperty
Location: C:\Program Files\Blender Foundation\Blender 4.2\4.2\scripts\modules\bpy\ops.py:109

Any ideas?

2

seems similar to this one:
Cannot assign a ‘dict’ value to the existing ‘bone_gizmo’ Group IDProperty - Support / Animation and Rigging - Blender Artists Community

There’s probably something that has changed in 4.2
If you think it’s a bug, please report it.

3

Just tested with Blender 3.6 LTS same code works just fine. However with colleague’s PC both older and newer versions work.

4

If it works on other pc’s with 4.2 installed, there could be a addon or extension interfering?
Maybe run Blender without any addons active, and see what happens?

If other Blender installs on the PC’s work, it’s something in your setup I’m afraid.