Solved. Small fix:
Go to line 328 ( file qtranslate-slug-with-widget.php )
Find lines:
// & workaround
$complete = str_replace('&','&',$home."/".$url);
and in front of these two lines add add small fix:
$url = ltrim(str_replace('//', '/', $url),"/");
// & workaround
$complete = str_replace('&','&',$home."/".$url);