React / Axios: Cannot read properties of undefined (reading '0')

I can see array with objects of data "fees" perfectly but if i wanna see a single value like fees[0]?.firstFee i get this error:

Uncaught TypeError: Cannot read properties of undefined (reading '0')

i thought ? operator would avoid this but seems like not...

const [fees, setFees] = useState();

useEffect(() => {
    const getFees = async () => {
      const res = await axios.get('/api/feesettings', {
        headers: { Authorization: token },
      });
      setFees(res.data);
    };

    getFees();
  }, []);

  console.log(fees);
  console.log(fees[0]?.firstFee );

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