FileDownload R "saltText" param Not working

In the FileDownload and FileDownloadLink not working param "saltText"
whith any saltText value only one hash is given.

i debug this.
in the "filedownload.class.php"
function _checkDb
in original:
$fdlObj = $this->modx->getObject('fdCount', array(
'ctx' => $file['ctx'],
'filename' => utf8_encode($file['filename']),
));
and worked function is:
$fdlObj = $this->modx->getObject('fdCount', array(
'ctx' => $file['ctx'],
'filename' => utf8_encode($file['filename']),
'hash' => $this->_setHashedParam($file['ctx'], $file['filename'])
));