Fatal error: Uncaught Error: Call to undefined function emtpy()

Hi there,

I believe since the update today the plugin is broken. I’m running PHP 7.4, latest WordPress, and I get the following fatal error upon saving a post, which is strange, since that function is a built-in function to PHP and has been there forever. Any pointers?

 Fatal error: Uncaught Error: Call to undefined function emtpy()
in /var/www/xxxxx/wp-content/plugins/subscribe2/classes/class-s2-admin.php on line 544

Aufrufstapel

S2_Admin::s2_meta_handler()
wp-includes/class-wp-hook.php:310
WP_Hook::apply_filters()
wp-includes/class-wp-hook.php:332
WP_Hook::do_action()
wp-includes/plugin.php:517
do_action()
wp-includes/post.php:4717
wp_insert_post()
wp-includes/post.php:4819
wp_update_post()
wp-admin/includes/post.php:426
edit_post()
wp-admin/post.php:227