@ -3245,7 +3245,7 @@ class rcube_imap
if (is_array($this->namespace['other'])) {
foreach ($this->namespace['other'] as $ns) {
foreach ((array)$ns as $root) {
if (strpos($mbox_name, $root[0]) === 0) {
if ($root[0] && strpos($mbox_name, $root[0]) === 0) {
return $mbox_name;
}