Blend animation cannot be exported

Describe the bug I have a test model that appears to be a valid blend file but cannot be exported to gltf.

To Reproduce

1. Open the Blend file.
2. Click on export glb.

Python: Traceback (most recent call last):
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\__init__.py", line 559, in execute
    return gltf2_blender_export.save(context, export_settings)
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 46, in save
    json, buffer = __export(export_settings)
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 66, in __export
    json = __fix_json(exporter.glTF.to_dict())
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 110, in __fix_json
    fixed[key] = __fix_json(value)
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 114, in __fix_json
    fixed.append(__fix_json(value))
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 110, in __fix_json
    fixed[key] = __fix_json(value)
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 114, in __fix_json
    fixed.append(__fix_json(value))
  File "C:\Users\ernest.lee\scoop\apps\blender\current\2.91\scripts\addons\io_scene_gltf2\blender\exp\gltf2_blender_export.py", line 117, in __fix_json
    if int(obj) == obj:
ValueError: cannot convert float NaN to integer

location: <unknown location>:-1

Expected behavior Not fail.

Screenshots

.blend file/ .gltf

assimp-mdb-sphere_rig_advanced.zip

Version

• OS: win 10
• Blender Version 2.91.0

Additional context https://github.com/assimp/assimp-mdb/tree/master/model-db/fbx/sphere_rig_advanced

[julienduroure]

Maybe we can:

• open a ticket in blender repo to share import issue that generate the problem ?
• add some check to have an error message instead of a crash when there are some NaN ?

[fire]

The blend shape being nan problem hasn’t blocked me some time. So create a new issue for your problem.