Is this plugin still being maintained? Errors in 5.5.1

I recently updated to 5.5.1, and with wp_debug enabled, I get the following errors:

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 15

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 16

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 15

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 16

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 15

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 16

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 15

Notice: Trying to access array offset on value of type null in /home/x/public_html/wp-content/plugins/codepen-embedded-pen-shortcode/codepen.php on line 16

Without wp_debug on, it seems to work as normal.