[Resolved] Two nested href anchors for each language in custom language switcher

He, I have PHP issue. My custom language switcher shortcode output twice a href tags. Here are the details :

PHP

function top_language_switcher() {
$languages = apply_filters( 'wpml_active_languages', NULL, 'skip_missing=0' );
if(!empty($languages)){
foreach($languages as $l){
if(!$l['active']){
$html = '';
$html .= ''.$l['native_name'].'';
}
}
}
return $html;
}
add_shortcode( 'top_lang', 'top_language_switcher' );

HTML OUTPUT has two nested href anchors, please check the screenshot.