React JS和Google电子表格:无法读取Null的属性“%2”

import React, { useEffect, useState } from 'react';

const SpreadsheetData = () => {
  const [data, setData] = useState([]);
  const [error, setError] = useState(null);

  useEffect(() => {
    const fetchData = async () => {
      try {
        const response = await fetch('YOUR_GOOGLE_SHEETS_API_ENDPOINT');
        const json = await response.json();
        if (json && json.values) {
          setData(json.values);
        } else {
          setError('Invalid data format received from the API.');
        }
      } catch (err) {
        setError(err.message);
      }
    };

    fetchData();
  }, []);

  if (error) {
    return <div>Error: {error}</div>;
  }

  return (
    <div>
      {data.map((row, index) => (
        <div key={index}>
          {row.map((cell, cellIndex) => (
            <span key={cellIndex}>{cell} </span>
          ))}
        </div>
      ))}
    </div>
  );
};

export default SpreadsheetData;