'var_aa' error

I ran Resfinder installed with pip in a conda environment. It returns the following error.

python -m resfinder -ifa ${fasta} -o ${outdir2}/${isolates} -j ${outdir2}/${isolates}/${isolates}_resfinder.json -s ${species} -u --acquired --disinfectant -c --ignore_missing_species -b ${blastn} -k ${kma}

Traceback (most recent call last):
  File "/lustre1/applications/conda/env/resfinder/lib/python3.9/runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/lustre1/applications/conda/env/resfinder/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/lustre1/applications/conda/env/resfinder/pypkg/resfinder/__main__.py", line 5, in <module>
    sys.exit(main())
  File "/lustre1/applications/conda/env/resfinder/pypkg/resfinder/run_resfinder.py", line 511, in main
    isolate.load_finder_results(std_table=std_result,
  File "/lustre1/applications/conda/env/resfinder/pypkg/resfinder/cge/phenotype2genotype/isolate.py", line 269, in load_finder_results
    unique_id_nuc, unique_id_aa = Isolate.get_phenodb_id(feat_info,
  File "/lustre1/applications/conda/env/resfinder/pypkg/resfinder/cge/phenotype2genotype/isolate.py", line 237, in get_phenodb_id
    f"_{feat_res_dict['var_aa']}")
  File "/lustre1/applications/conda/env/resfinder/lib/python3.9/collections/__init__.py", line 1058, in __getitem__
    raise KeyError(key)
KeyError: 'var_aa'

What would be the error means?
(FYI my Resfinder version)

python -m resfinder --version
4.3.2

‌

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