PHP 8.1 Fatal error

I am using the premium version of this plugin but it might affect all versions. Posting the error message below:

The following fatal error has occured:? \n? \n Uncaught TypeError: htmlspecialchars(): Argument #1 ($string) must be of type string, array given in /var/www/websitename.com/htdocs/wp-content/plugins/handl-utm-grabber/handl-utm-grabber.php:47
Stack trace:
#0 /var/www/websitename.com/htdocs/wp-content/plugins/handl-utm-grabber/handl-utm-grabber.php(47): htmlspecialchars()