title: What is the cause of "Loading initial props cancelled" in Nextjs?
body: <p>In our application we have a few different users (~20 according to Plumbr) per day who get the following exception</p>
  <p><code>Error: Loading initial props cancelled</code></p>
  <p>We have determined that the error comes from the <code>_getData&lt;T&gt;</code> method in router.ts but haven't been able to figure out the cause nor reproduce it. We have tried adding throttling using Chrome dev tools and doing multiple actions that call router in quick succession but no dice.</p>
  <p>What causes the error?</p>