title: "Cannot read property '_blazorFilesById' of null error" with Blazor InputFile component
body: <p>I've started getting this error from my Blazor WebAssembly app:</p>
  <blockquote>
  <p>&quot;Cannot read property '_blazorFilesById' of null error&quot; with Blazor app</p>
  </blockquote>
  <p>I'm assuming that's related to the <code>InputFile</code> <a href="https://docs.microsoft.com/en-us/aspnet/core/blazor/file-uploads?view=aspnetcore-5.0#inputfile-component" rel="noreferrer">component</a> I'm using, which has been working fine.</p>
  <p>I've tried restarting VS, clean &amp; rebuilding, restarting IIS and killing Chrome all to no avail.  What could be causing this?</p>