[Plugin: Jetpack] Twice sharing buttons

If I modify the first “original” code I obtain a ” Fatal error: Class ‘Jetpack_Likes’ not found in … etc. .

I replaced the function’s code with this:

function jptweak_remove_share() {
    remove_filter( 'the_content', 'sharing_display',19 );
    remove_filter( 'the_excerpt', 'sharing_display',19 );
    if ( class_exists( 'Jetpack_Likes' ) ) {
        remove_filter( 'the_content', array( Jetpack_Likes::init(), 'post_likes' ), 30, 1 );
    }
}
add_action( 'loop_start', 'jptweak_remove_share' );

and now it works. Can I reccomend You to modify the code on Your article?

Thanks for Your support!