Passing null parameter to str_replace() makes wordpress debug to give an error on PHP > 8.1

[Webstijlen]

Passing null parameter to str_replace() makes wordpress debug to give an error on PHP > 8.1

Error

Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /var/www/html/wp-content/plugins/highlighting-code-block/class/loos_hcb.php on line 79

Environment
Using PHP 8.3

Fix

/highlighting-code-block/class/loos_hcb.php
Rule number 80

Situation Now

$content = str_replace( 'prism on-numbers', 'prism line-numbers', $content );

Proposal

$content = str_replace( 'prism on-numbers', 'prism line-numbers', $content ?? '');

References

https://magento.stackexchange.com/posts/369717/timeline

tested and error message is gone