title: Each child in a list should have a unique "key" prop:: webpack-internal:///./node_modules/next/dist/pages/_document.js:304:1)
body: <p>I am getting this warning:</p>
  <pre><code>Warning: Each child in a list should have a unique &quot;key&quot; prop. See https://reactjs.org/link/warning-keys for more information.
      at Head (webpack-internal:///./node_modules/next/dist/pages/_document.js:304:1)
      at html
      at Html (webpack-internal:///./node_modules/next/dist/pages/_document.js:260:19)
      at MyDocument (webpack-internal:///./src/pages/_document.tsx:23:1)
  </code></pre>
  <p>It is difficult to debug because there's not information about where in my code could be causing this warning. I have looked through my code and did not see any lists with children without keys. I am guessing the warning may be internal/from a config file. I would appreciate thoughts on what could be causing it &amp; how I might fix it.</p>
  <p>When does it happen: When I'm on dev mode (using yarn dev) and I navigate to my localhost:3000.</p>