How to remove a widget from the sidebar on specific page?

function my_theme_sidebars_widgets( $sidebars_widgets ) {

if(is_page(28))
    $sidebars_widgets['sidebar-10'][2] = null;

return $sidebars_widgets;
}
add_filter( 'sidebars_widgets', 'my_theme_sidebars_widgets' );

ok, I have found a filter for it. I hope this ‘null’ is fine.

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