Bug after deselecting/selecting pitch plot

[hsercanatli]

Got this error

Traceback (most recent call last):
  File "/home/mtg-hsercanatli/Documents/codes/dunya-desktop/dunyadesktop_app/widgets/playerframe.py", line 229, in wf_region_changed
    hop_size=self.hop_size)
  File "/home/mtg-hsercanatli/Documents/codes/dunya-desktop/dunyadesktop_app/widgets/timeserieswidget.py", line 130, in update_plot
    plot_y = downsample_plot(self.pitch_plot[start:stop], self.limit)
TypeError: 'NoneType' object has no attribute '__getitem__'
Aborted (core dumped)