'NoneType' object has no attribute 'with_suffix'

[unfuug]

Description

I ran into the same issue described in #15 when trying to download the large model for German. But I also get the error when running the script without parameters:

Note: I am using uv to manage venvs.

❯ python chapterize_ab.py



──────────────────────────────────────────────────────────────────────────────────── Starting script ─────────────────────────────────────────────────────────────────────────────────────


Preparing chapterfying magic ⚡...


Traceback (most recent call last):
  File "/home/lutz/Hörbücher/Chapterize-Audiobooks/chapterize_ab.py", line 1078, in <module>
    main()
    ~~~~^^
  File "/home/lutz/Hörbücher/Chapterize-Audiobooks/chapterize_ab.py", line 970, in main
    audiobook_file, in_metadata, lang, model_name, model_type, cue_file = parse_args()
                                                                          ~~~~~~~~~~^^
  File "/home/lutz/Hörbücher/Chapterize-Audiobooks/chapterize_ab.py", line 316, in parse_args
    args.audiobook.with_suffix('.cue').exists()
    ^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'with_suffix'

System

OS: CachyOS (based on Arch)
uv version: 0.10.9
Python version: 3.14.3 (also tried 3.11)

Steps to reproduce

Create venv:

❯ uv venv -p 3.14
Using CPython 3.14.3 interpreter at: /usr/bin/python3.14
Creating virtual environment at: .venv
Activate with: source .venv/bin/activate.fish

Install requirements:

❯ uv pip install vosk rich requests
Resolved 15 packages in 3ms
Installed 15 packages in 22ms
 + certifi==2026.2.25
 + cffi==2.0.0
 + charset-normalizer==3.4.5
 + idna==3.11
 + markdown-it-py==4.0.0
 + mdurl==0.1.2
 + pycparser==3.0
 + pygments==2.19.2
 + requests==2.32.5
 + rich==14.3.3
 + srt==3.5.3
 + tqdm==4.67.3
 + urllib3==2.6.3
 + vosk==0.3.45
 + websockets==16.0

Run:

❯ uv run chapterize_ab.py

Notes

• I also tested .venv/bin/python chapterize_ab.py and source .venv/bin/activate.fish, followed by python chapterize_ab.py with the same result.
• I did not modify any files. I cloned the repo and ran whats listed above.

Output of pip list -v:

❯ uv pip list -v
DEBUG uv 0.10.9 (f675560f3 2026-03-06)
DEBUG Searching for default Python interpreter in virtual environments, managed installations, or search path
DEBUG Found `cpython-3.14.3-linux-x86_64-gnu` at `/home/lutz/Hörbücher/Chapterize-Audiobooks/.venv/bin/python3` (active virtual environment)
DEBUG Using Python 3.14.3 environment at: .venv
Package            Version
------------------ ---------
certifi            2026.2.25
cffi               2.0.0
charset-normalizer 3.4.5
idna               3.11
markdown-it-py     4.0.0
mdurl              0.1.2
pycparser          3.0
pygments           2.19.2
requests           2.32.5
rich               14.3.3
srt                3.5.3
tqdm               4.67.3
urllib3            2.6.3
vosk               0.3.45
websockets         16.0

[unfuug]

Even the docker image built from the provided Dockerfile seems to have the same issue:

❯ sudo docker run --rm chapterizeaudiobooks



─────────────────────────────── Starting script ────────────────────────────────


Preparing chapterfying magic ⚡...


Traceback (most recent call last):
  File "/usr/src/app/chapterize_ab.py", line 1078, in <module>
    main()
  File "/usr/src/app/chapterize_ab.py", line 970, in main
    audiobook_file, in_metadata, lang, model_name, model_type, cue_file = parse_args()
  File "/usr/src/app/chapterize_ab.py", line 316, in parse_args
    args.audiobook.with_suffix('.cue').exists()
AttributeError: 'NoneType' object has no attribute 'with_suffix'

Here is a pastebin with the full stdout from the docker image build.