Mint 16 64bit- Attempt to assign destination "Sorry, this should not have happened"

[Raymond]

Probably a Mint-16 error but the popup said to register the error here.
And then it proceeded to work?
System: LinuxMint
Release 16 (petra)
Kernel Linux 3.11.0-12
Mate 1.6.1
Simple Backup Suite 0.11.4

Quote from error message during destination assignment.
--------------------------------------------------------------------
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
----------------------------------------------------------------------

Actually the popup occurred at the start of the second evocation of the administration as well. It still proceeded ok.