Changing passwords in Usermin

Hi, I can’t change passwords of any users in Usermin if I fill out the “Current password” field, it complains about the password being wrong.
However, if I leave the current password blank, it successfully changes the password.

With the “Current password” field filled out with the correct password:
Failed to change password : /usr/share/webmin/virtual-server/ -vhost- failed :
Old password: ************
New password: **********
Wrong password

With the “Current password” field empty:
Your password for -vhost- has been changed successfully. Any telnet, SSH, FTP or POP3 logins made from now on will require the new password.

However, your Samba password was not changed :

Failed to find entry for user -vhost-.