utf8_encode(): Passing null to parameter #1 ($string) of type string is deprecated

[neopheus]

Describe the Bug

utf8_encode(): Passing null to parameter #1 ($string) of type string is deprecated at /vendor/phpoffice/phpword/src/PhpWord/TemplateProcessor.php:261

Context

• PHP Version: 8.1
• PHPWord Version: 0.18.3