Meta Shortcodes Error in WordPress 5

After updating a site to wordpress 5 that uses the meta shortcodes option of the plug in I’ve been getting error messages on any page that is trying to load a shortcode:

Warning: Illegal string offset ‘content’ in /home/xxxxxx/public_html/wp-content/plugins/custom-content-shortcode/includes/optional/meta-shortcodes.php on line 128

Warning: Cannot assign an empty string to a string offset in /home/xxxxxx/public_html/wp-content/plugins/custom-content-shortcode/includes/optional/meta-shortcodes.php on line 128

Warning: Invalid argument supplied for foreach() in /home/xxxxxx/public_html/wp-content/plugins/custom-content-shortcode/includes/optional/meta-shortcodes.php on line 130

Warning: Illegal string offset ‘content’ in /home/xxxxxx/public_html/wp-content/plugins/custom-content-shortcode/includes/optional/meta-shortcodes.php on line 128

Warning: Cannot assign an empty string to a string offset in /home/xxxxxx/public_html/wp-content/plugins/custom-content-shortcode/includes/optional/meta-shortcodes.php on line 128

Warning: Invalid argument supplied for foreach() in /home/xxxxxx/public_html/wp-content/plugins/custom-content-shortcode/includes/optional/meta-shortcodes.php on line 130

I’m guessing some kind of issue with the new wordpress?