title: Getting exception "PhpOffice \ PhpSpreadsheet \ Reader \ Exception" when parsing specific csv file
body: <p>Something in a csv file I am trying to import using Maatwebsite's Laravel Excel package (which uses PhpOffice's PhpSpreadsheet package) is causing the import to blow up with the following exception:</p>
  
  <pre><code>PhpOffice \ PhpSpreadsheet \ Reader \ Exception
  C:\Users\jasona\AppData\Local\Temp\laravel-excel-mbAxJfb8Hm5yF5BKNzhJ0MZmmMzAHQnR is an Invalid Spreadsheet file
  </code></pre>
  
  <p>I believe there is some data in the file causing this to blow up as if I reduce the number of records in the file down to a few, it works just fine.  Problem is, I do not know what I am looking for as the root cause of this.  Has anyone else run into this issue?  What am I looking for?</p>