Errors when saving pages

Hello,

Every time I try to save a page I get this error:

Notice: Undefined offset in /home/xxxx/public_html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/codeblock.php on line 250

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxx/public_html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/codeblock.php:250) in /home/xxxx/public_html/wp-admin/post.php on line 198

Warning: Cannot modify header information - headers already sent by (output started at /home/xxxx/public_html/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/codeblock.php:250) in /home/xxxx/public_html/wp-includes/pluggable.php on line 1219

The page is correctly saved and it only happens if the code block element is used.

I tried to reupload the theme files but no luck! WP, plugins and theme are at latest version.

Thank you