crash when adding exercises to a new workout

If you create a workout and try to add an exercise, the following stack trace appears:

2010-01-03 20:45:38,612 INFO sqlalchemy.engine.base.Engine.0x...cd0c []
Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/pumped/views/gui_gtk.py", line 531, in on_exercise_combo_changed
    self._result_id = self._workout_controller.add_result(self._workout_id, exercise.id)
  File "/usr/local/lib/python2.6/dist-packages/pumped/controllers/training_controller.py", line 91, in add_result
    result.workout = Workout.query.filter_by(id=workout_id).one()
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.6-py2.6.egg/sqlalchemy/orm/query.py", line 1326, in one
    raise orm_exc.NoResultFound("No row was found for one()")
sqlalchemy.orm.exc.NoResultFound: No row was found for one()

If the workout is first saved, and then edited to add the exercises, the error does not occur.