bpy.ops.import_scene.gltf doesn't work with bpy.ops.wm.read_factory_settings?

I’m trying to load gltf after clearing the scene, like shown here: https://github.com/KhronosGroup/glTF-Blender-IO/blob/7a3532e32fcce61ab08aa0c081282e72e668ea4c/tests/roundtrip_gltf.py But I’m getting the error:

Error: Traceback (most recent call last):
  File "\Text", line 34, in <module>
  File "\Text", line 32, in process_one
  File "\Text", line 12, in process_gltf
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\modules\bpy\ops.py", line 201, in __call__
    ret = op_call(self.idname_py(), None, kw)
RuntimeError: Error: Traceback (most recent call last):
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\__init__.py", line 900, in execute
    return self.import_gltf2(context)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\__init__.py", line 919, in import_gltf2
    return self.unit_import(self.filepath, import_settings)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\__init__.py", line 937, in unit_import
    BlenderGlTF.create(self.gltf_importer)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\blender\imp\gltf2_blender_gltf.py", line 42, in create
    BlenderGlTF._create(gltf)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\blender\imp\gltf2_blender_gltf.py", line 49, in _create
    BlenderScene.create(gltf)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\blender\imp\gltf2_blender_scene.py", line 40, in create
    BlenderNode.create_vnode(gltf, 'root')
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\blender\imp\gltf2_blender_node.py", line 51, in create_vnode
    BlenderNode.create_vnode(gltf, child)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\blender\imp\gltf2_blender_node.py", line 40, in create_vnode
    BlenderNode.create_bones(gltf, vnode_id)
  File "C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\addons\io_scene_gltf2\blender\imp\gltf2_blender_node.py", line 134, in create_bones
    bpy.context.window.scene = bpy.data.scenes[gltf.blender_scene]
AttributeError: 'NoneType' object has no attribute 'scene'

location: C:\Program Files\Blender Foundation\Blender 2.83.4\2.83\scripts\modules\bpy\ops.py:201

[scurest]

Okay, I can reproduce OP’s stack trace. To trigger it you need to run blender without the -b (headless) option. Deleting that line does not fix it, it will error again when we try to switch to edit mode.

I’m assuming this is for the same reason as: https://stackoverflow.com/questions/28075599/opening-blend-files-using-blenders-python-api/28083541#28083541

#1184 does fix it.

[vergol]

Yes, thank you.