ビューが正しく表示されない????

Question

前提・実現したいこと

発生している問題・エラーメッセージ

Chrome の Console での表示は以下になります。

react_devtools_backend.js:6 Warning: Received NaN for the `children` attribute. If this is expected, cast the value to a string.
    in div (created by Counter)
    in Counter (created by ConnectFunction)
    in ConnectFunction (created by App)
    in Provider (created by App)
    in App

該当のソースコード

components/Counter/presentation.jsx

import React from "react";

const Counter = ({ count, increment, decrement }) => (
  <>
    <div>{count}</div>
    <button onClick={() => increment(1)}>+</button>
    <button onClick={() => decrement(1)}>-</button>
  </>
);

export default Counter;

Comments

[hoshi-takanori]

よく分かりませんが、count が NaN なのでしょう。