Error "Invalid cell coordinate A-1" reading HTML file

[danmodini]

This is:

- [*] a bug report
- [ ] a feature request
- [ ] **not** a usage question (ask them on https://stackoverflow.com/questions/tagged/phpspreadsheet or https://gitter.im/PHPOffice/PhpSpreadsheet)

What is the expected behavior?

Open flawessly the html file

What is the current behavior?

Gives an error "Invalid cell coordinate A-1"

What are the steps to reproduce?

<?php

require __DIR__ . '/vendor/autoload.php';

// Create new Spreadsheet object
$spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();

$objPHPExcel = PhpSpreadsheet\IOFactory::load('Nomina_30539141909_202102_000.xls'); // it is a html file

### Which versions of PhpSpreadsheet and PHP are affected?
1.17.1
[Nomina_30539141909_202102_000.xls](https://github.com/PHPOffice/PhpSpreadsheet/files/6386224/Nomina_30539141909_202102_000.xls)

I find a personal solution limiting the value of $row to 1 in line 473:

           if ($this->tableLevel > 1 && $row>1) {
                --$row;
            }
this is because the hyphen in the error is a minus sign. I dont know if this workaround breakes something else...
Thank you at advance

Daniel