Traceback (most recent call last):
  File "/usr/share/system-config-users/system-config-users.py", line 46, in <module>
    mainWindow.mainWindow()
  File "/usr/share/system-config-users/mainWindow.py", line 311, in __init__
    self.refresh()
  File "/usr/share/system-config-users/mainWindow.py", line 517, in refresh
    self.populate_lists()
  File "/usr/share/system-config-users/mainWindow.py", line 616, in populate_lists
    self.populate_user_list()
  File "/usr/share/system-config-users/mainWindow.py", line 574, in populate_user_list
    self.userStore.set_value(iter, 1, uidNumber)
TypeError: value is of the wrong type for this column

It worked long enough for me to add my own local user, but now if fails this way consistently.