Crash when trying to select destination inrestore operation

[Trevor H]

Sorry, this should not have happened

An uncaught error occurred. Close this message window and restart the application.

Please report this error on https://bugs.launchpad.net/sbackup.

coercing to Unicode: need string or buffer, NoneType found

Traceback (most recent call last):
  File "/usr/share/sbackup/sbackup/ui/configgui.py", line 1103, in on_dest1_toggled
    self.on_dest_localpath_selection_changed()
  File "/usr/share/sbackup/sbackup/ui/configgui.py", line 1542, in on_dest_localpath_selection_changed
    if (os.path.isdir(_target) and os.access(_target, os.R_OK | os.W_OK | os.X_OK)):
  File "/usr/lib/python2.7/genericpath.py", line 41, in isdir
    st = os.stat(s)
TypeError: coercing to Unicode: need string or buffer, NoneType found

Linux Mint 15
sbackup 0.11.4
if it was not included by default it woudl have been installed from the standard repositories

Also whenI ran it last night it tried to tell me this was the first time but U have a backup on an external disk I saw a bug report about lost configs of you start the gui without the back up drive attached-could be that then