Problemas con los albaranes clientes de tryton

[Daniel Horacio Gobetto]

Hola buenas .. tengo un problema cuando quiero entregar productos

me tira esto el tryton....

Traceback (most recent call last):
  File "/trytond/protocols/jsonrpc.py", line 125, in _marshaled_dispatch
    response['result'] = dispatch_method(method, params)
  File "/trytond/protocols/jsonrpc.py", line 158, in _dispatch
    res = dispatch(*args)
  File "/trytond/protocols/dispatcher.py", line 163, in dispatch
    result = rpc.result(meth(inst, *c_args, **c_kwargs))
  File "/trytond/model/model.py", line 406, in on_change_with
    changes[fieldname] = getattr(self, method_name)()
  File "/trytond/model/fields/field.py", line 86, in wrapper
    return func(self, *args, **kwargs)
  File "/trytond/modules/stock/shipment.py", line 1006, in on_change_with_customer_location
    return self.customer.customer_location.id
AttributeError: 'NoneType' object has no attribute 'id'

alguna guia por favor... desde ya muchas gracias.