traceback on slower/faster before file is open and on first audio file open

[pabs3]

With 0.9 from Debian unstable I get the following traceback in the terminal (the UI continues) sometimes when I open an Ogg file the first time and also when I use the Slower/Faster menu items before a file has been opened.

Traceback (most recent call last):
  File "/usr/bin/gtranscribe", line 386, in on_scale_speed_value_changed
    self.player.rate = value
  File "/usr/lib/python3/dist-packages/gtranscribe/player.py", line 131, in _set_rate
    pos[1] = -1
TypeError: '_ResultTuple' object does not support item assignment