switching to player without model tracebacks (but does not block)

Traceback (most recent call last):
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/core/input_manager.py", line 196, in _emit_event
    sig.emit(event)
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/core/utils/signal.py", line 159, in emit
    receiver(*args, **kw)
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/core/backend.py", line 117, in dispatch_input
    event_processed = controller.handle_input(input_event)
  File "/home/ben/dev/elisa/trunk/elisa-plugins/elisa/plugins/raval_frontend/grid_controller.py", line 106, in handle_input
    return super(GridController, self).handle_input(input_event)
  File "/home/ben/dev/elisa/trunk/elisa-plugins/elisa/plugins/raval_frontend/list_controller.py", line 141, in handle_input
    self.activate_item(input_event.origin)
  File "/home/ben/dev/elisa/trunk/elisa-plugins/elisa/plugins/raval_frontend/grid_controller.py", line 120, in activate_item
    super(GridController, self).activate_item(origin)
  File "/home/ben/dev/elisa/trunk/elisa-plugins/elisa/plugins/raval_frontend/list_controller.py", line 68, in activate_item
    root.slideshow.focus()
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/base_components/controller.py", line 96, in focus
    self.backend.focused_controller = self
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/core/backend.py", line 86, in focused_controller__set
    controller.focused = True
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/core/observers/observable.py", line 77, in __setattr__
    super(Observable, self).__setattr__(key, new_value)
  File "/home/ben/dev/elisa/trunk/elisa-core/elisa/base_components/controller.py", line 108, in focused__set
    self.focused_changed(old_focused, focused)
  File "/home/ben/dev/elisa/trunk/elisa-plugins/elisa/plugins/raval_frontend/elisa_controller.py", line 246, in focused_changed
    if self.player.current_model.file_type == "video" and \
  File "/home/ben/dev/elisa/trunk/elisa-plugins/elisa/plugins/player/player_controller.py", line 262, in current_model__get
    return self.model[self._current_index]
TypeError: 'NoneType' object is unsubscriptable