Php Horde Problem

[misterbighh]

Notice: Undefined variable: folder in /var/www/kolab/htdocs/horde/lib/Horde/Share/kolab.php on line 922

at line 922 is this

$folder = isset($matches[4]) ? $folder : $folder . $user_domain;
   return $matches[2] . $user_domain;
      } elseif ($matches[1] == 'shared.') {
   return 'anonymous';
      }
    }

    /**
     * Gets one of the attributes of the object, or null if it isn't defined.
     *
     * @param string $attribute  The attribute to get.
     *
     * @return mixed  The value of the attribute, or null.
     */

[Gunnar Wrobel]

What are the circumstances of this error?

[misterbighh]

When I log me in I see this Notice

Notice: Undefined variable: folder in /var/www/kolab/htdocs/horde/lib/Horde/Share/kolab.php on line 922