Disable Set first image as post’s featured image.

This Work’s

add_action( 'save_post', 'set_featured_image' );
function set_featured_image( $post_id )
{
    global $wpdb, $plugin_prefix;
    $post_type = get_post_type($post_id);
    $table_name = $plugin_prefix . $post_type . '_detail';
    $obj_geodir_profilbild = $wpdb->get_results(  $wpdb->prepare(     "SELECT geodir_profilbild FROM " . $table_name . " WHERE post_id = %d   ", array($post_id) ));

      if (count($obj_geodir_profilbild)>0)
    {
          $geodir_profilbild  =$obj_geodir_profilbild[0]->geodir_profilbild;
    }
// todo Check if featured image exists
   Generate_Featured_Image( $geodir_profilbild,   $post_id );
}

function Generate_Featured_Image( $image_url, $post_id  )
{

    $upload_dir = wp_upload_dir();
    $image_data = file_get_contents($image_url);
    $filename = basename($image_url);
    if(wp_mkdir_p($upload_dir['path']))     $file = $upload_dir['path'] . '/' . $filename;
    else                                    $file = $upload_dir['basedir'] . '/' . $filename;
    file_put_contents($file, $image_data);

    $wp_filetype = wp_check_filetype($filename, null );
    $attachment = array(
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => sanitize_file_name($filename),
        'post_content' => '',
        'post_status' => 'inherit'
    );
    $attach_id = wp_insert_attachment( $attachment, $file, $post_id );
    require_once(ABSPATH . 'wp-admin/includes/image.php');
    $attach_data = wp_generate_attachment_metadata( $attach_id, $file );
    $res1= wp_update_attachment_metadata( $attach_id, $attach_data );
    $res2= set_post_thumbnail( $post_id, $attach_id );
}