dell-recovery dbus python error

I've got a new dell xps13 (delivered 3 days ago) and want to create a recovery disk. The tool dell-recovery fails with this traceback:

scip@nubic: % dell-recovery 
ERROR:dbus.connection:Unable to set arguments (None, b'/dev/sda3', 'A00', '/home/scip/Downloads/ubuntu-14.04-amd64-dell_A00.iso') according to signature 'ssss': 
 
  : Expected a string or unicode object
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/Dell/recovery_basic_gtk.py", line 180, in wizard_complete
    *args)
  File "/usr/lib/python3/dist-packages/Dell/recovery_common.py", line 734, in dbus_sync_call_signal_wrapper
    dbus_iface.get_dbus_method(func)(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 137, in __call__
    **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 584, in call_async
    message.append(signature=signature, *args)
TypeError: Expected a string or unicode object

  

  
Is there a fix for this error available or another method to create the image (commandline)?
  

  

  
Thanks