Hello,
UPDATE: phpdocx 14.5 is compatible with all PHP versions from PHP 5.6 to PHP 8.3
phpdocx is compatible with PHP 7.3 since the release of phpdocx 8.5: https://www.phpdocx.com/news/post/phpdocx-v8-5-release-notes/217 . PHP 7.4 is compatible since phpdocx 9.5: https://www.phpdocx.com/news/post/phpdocx-v9-5-release-notes/219
We recommend you upgrade to use PHP 7.3 and PHP 7.4. Otherwise, incompatible issues may appear.
Regards.