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我正在尝试从映射中的结构返回用户名，但出现此错误：错误：参数“未定义”必须是有效的十六进制字符串。

contract UserStorage is BaseStorage {

    event UserCreated(string _message);

    struct Profile {
        uint userId;
        bytes32 username;
      }

    mapping(address => Profile) public profiles;
    mapping(address => bool) public addresses;
    mapping (bytes32 => uint) public usernames;


    uint latestUserId = 0;

    function createUser(
        address _address,
        bytes32 _username
        ) public onlyControllerAddr returns(uint) {

        latestUserId++;

        profiles[_address] = Profile(
        latestUserId,
        _username
        );



        addresses[_address] = true;
        usernames[_username] = latestUserId;

        emit UserCreated("Membership Confirmed");
        return latestUserId;
    }

}

class UserAccount extends React.Component {
 state = { dataKey: null };

componentDidMount() {
   const { drizzle, drizzleState } = this.props;
   const contract = drizzle.contracts.UserStorage;
   const account = drizzleState.accounts[0];


  const dataKey = contract.methods['profiles'].cacheCall(account);
  this.setState({ dataKey });

 }


 render() {

   const { UserStorage } = this.props.drizzleState.contracts;
   const displayData = UserStorage.profiles[this.state.dataKey];
   const user =  displayData && displayData.value[1];
   const username = Web3.utils.hexToUtf8(user);
   console.log(user);
   return (
   <div>Hello: {user}</div>
   )
 }
}

export default UserAccount;

以下是返回的值：

用户：0x426f620000000000000000000000000000000000000000000000000000000000

const displayData: {args: Arguments(1), fnIndex: 6, value: Result, error: null}args: Arguments ["0x1C16e11e45Ae1601186E05EE64f38276FAb2239a", callee: (...), Symbol(Symbol.iterator): ƒ]error: nullfnIndex: 6value: Result {0: "1", 1: "0x426f620000000000000000000000000000000000000000000000000000000000", userId: "1", username: "0x426f620000000000000000000000000000000000000000000000000000000000"} proto : Object

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