Found a solution thanks to the guys in IRC channel 🙂
copy from wp-include/widgets.php following function into your themes/default/functions.php
function wp_tag_cloud( $args = '' ) {
rename the function, for example get_tag_cloud (…..
and change last line in that function from “echo” to “return”
return apply_filters( 'wp_tag_cloud', $return, $args );
Works 🙂
