Deprecated situation on

[sebastian-czarnecki]

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This is:

- [X] 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?

No warning

What is the current behavior?

Message in PHP 8.1.6: PHP Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in (...)\PHPSpreadsheet\PHPSpreadsheet\phpoffice\phpspreadsheet\src\PhpSpreadsheet\Writer\Xlsx\Worksheet.php on line 1224

What are the steps to reproduce?

(long procedure in source code, difficult to find exactly code)

What features do you think are causing the issue

• [ ] Reader
• [X] Writer
• [ ] Styles
• [ ] Data Validations
• [ ] Formula Calulations
• [ ] Charts
• [ ] AutoFilter
• [ ] Form Elements

Does an issue affect all spreadsheet file formats? If not, which formats are affected?

Not registered for now. Probably will be in the future.

Which versions of PhpSpreadsheet and PHP are affected?

newest for now.