problem with wp_insert_comment hook in wp 4.2.2

Hi,

I updated my wp instance to version 4.2.2 but it seems that some issues occur.
In order to perform a test, I’ve disabled the function ‘add_action’ in the comment-email-reply/file cer_plugin.php:

# Fire Email when comments is inserted and is already approved.
#add_action('wp_insert_comment','cer_comment_notification',99,2);

and I’ve used a simple message popup:

function echo_test() {
   echo "<script>alert('OK !');</script>";
}
add_action('wp_insert_comment', 'echo_test', 99, 0 );

When I try to test a reply to a post comment, no popup appears.
Can you chack please?

https://wordpress.org/plugins/comment-email-reply/