Loading issue writing a plugin for extend CF7

Hello everyone

I’ve got an issue creating a plugin to extend CF7. When the user submitted the form, I read a field (in example, ‘field-name’). Then, I look for ‘my_number’, a number for a unique ‘field-name’ in a database table. Last of all, I add the new field with the number value to the form and I send it.

The code runs perfectly, I receive all data correctly, but when the user clicks on the button, the spinning arrows are loading forever for the sender. Disable JS is not a valid solution for me and I’m sure that’s my plugin which is making wrong this because when I disable the plugin, CF7 works fine.

Why can my code affect JS for the CF7 plugin? It’s very simple and I don’t use any JavaScript, I’m confused. I’ve wrote a previous version of the plugin and I had not any problem with this.

Can you help me, please?
Thanks (and sorry for my poor English)

This is my code, simplified:

<?php
/* The tipical WordPress plugin header */

function my_search($cf7) {
 //Getting the data
 $my_data = $cf7['field-name']; 

 //Finding the number on database
 global $wpdb;
 $my_query = "SELECT my_number FROM wp_my_database WHERE (my_column='$my_data')";
 $result = $wpdb->get_results( $my_query );

 //Creating a new field for the data
 foreach ( $result as $row )
   $cf7['field-number'] = (string)$row->my_number;
 return $cf7;
}

add_filter("wpcf7_posted_data", "my_search");

?>

https://ww.wp.xz.cn/plugins/contact-form-7/