fix: resolve IndexError when using spk model and the audio contains only 1 ...

Atomie CHEN

2024-03-25 ff83116369ba6afe56430cb0b9d977fbe7f4bced

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satu    1
dua    2
tiga    3
empat    4
lima    5
enam    6
tujuh    7
delapan    8
sembilan    9