title: TypeError: Cannot read property 'map' of null
body: <p><a href="https://i.stack.imgur.com/U2acJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U2acJ.png" alt="enter image description here" /></a></p>
  <p>I couldn't understand why...here is the GitHub repository: <a href="https://github.com/Dronrom/React-test" rel="nofollow noreferrer">https://github.com/Dronrom/React-test</a></p>