FIX 'NoneType' object has no attribute 'isalpha' (#2440)

passerbya

2025-03-20 5ee2f382b32c5c0beaa1c133b466a100c6fb7ebc

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열    10
스물    20
서른    30
마흔    40
쉰    50
예순    60
일흔    70
여든    80
아흔    90