Trying to access array offset on value of type null (Xls Reader)

[hannanyusop]

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?

Phpspread can read the xls file

What is the current behavior?

error
"class": "ErrorException",
"message": "Trying to access array offset on value of type null",
"code": 0,
"file": ...//vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Reader/Xls.php:7015",

for now im using below code to keep my system running.

$data = $this->externalNames[$index - 1]['name'] ?? "";

What are the steps to reproduce?

Please provide a Minimal, Complete, and Verifiable example of code that exhibits the issue without relying on an external Excel file or a web server:

<?php

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

$spreadsheet = $reader->load($file);
 $writer    = new \PhpOffice\PhpSpreadsheet\Writer\Xls($spreadsheet);
 $writer->save('test.xls');

?>





### Which versions of PhpSpreadsheet and PHP are affected?
[CIMB BizConverter.xls](https://github.com/PHPOffice/PhpSpreadsheet/files/7286322/CIMB.BizConverter.xls)

[oleibman]

This issue is nominally solved by PR #2312. However, that PR is not yet in a state where it can be merged.

[hannanyusop]

ETA to being merge into master? Tqq in advance

[oleibman]

As mentioned, I cannot merge your PR as it stands now. It needs to show 1 module changed, not 97.

[PowerKiKi]

Fixed via ca5bd9b