Intermittent error when extracting files from the game Autonauts

[sparr]

Code
The code in question lives at https://github.com/sparr/vgm-extractor/tree/548abc7d017edfad06dd55170c9a0c7269c56dff but I have not reduced this to a test case yet. I will try to do so when I have a chance.

It is effectively attempting to do this:

extract_assets(
    "Autonauts_Data/sharedassets0.assets",
    ".",
    use_container = False,
    append_path_id = False,
    asset_filter = asset_filter,
)

This problem also occurs with Slipways_Data/resources.assets from the game Slipways.

Error

  File "/home/sparr/.local/share/virtualenvs/vgm-extractor-1oHW3IDG/lib/python3.11/site-packages/UnityPy/tools/extractor.py", line 138, in extract_assets
    export_obj(
  File "/home/sparr/.local/share/virtualenvs/vgm-extractor-1oHW3IDG/lib/python3.11/site-packages/UnityPy/tools/extractor.py", line 69, in export_obj
    return export_func(obj, fp, extension)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sparr/.local/share/virtualenvs/vgm-extractor-1oHW3IDG/lib/python3.11/site-packages/UnityPy/tools/extractor.py", line 234, in exportAudioClip
    if len(samples) == 0:
       ^^^^^^^^^^^^
TypeError: object of type 'NoneType' has no len()

Bug
The samples here is None about half the time when I try to extract files from this game, and there is no error the other half. There may be a race condition of some sort?

To Reproduce

1. Use python 3.11.3 and UnityPy 1.10.1 plus Handle relative and case insensitive file paths #191
2. Clone the vgm-extractor repo linked above
3. Install the game Autonauts via Steam
4. src/vgm-extractor.py -vvvv -o tmp --rescan --overwrite --steamlibrarypath ~/.steam/steam "Autonauts"

[K0lb3]

I forgot to reply to this issue as I never came around to bothering to install a whole game just to check an issue.
The code shouldn't error anymore as samples are either populated or an empty dict now.
The most likely cause for an empty result would be fmod failing to convert the files.