fix list index out of range error (#2122)

Nixon

2024-10-09 5dbe6898cac191d12c487772d7336ab2b2a9c350

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BAC009S0764W0121 <|Speech|>
BAC009S0916W0489 <|Speech|>
asr_example_cn_en <|Speech|>
ID0012W0014 <|Speech|>