Traceback (most recent call last):
Traceback (most recent call last):
  File ".../path/to/matplotlib/backends/backend_qt5.py", line 440, in _draw_idle
    self.draw()
  File "/home/antony/src/local/mplcairo/lib/mplcairo/base.py", line 269, in draw
    self.get_renderer(_ensure_cleared=True, _ensure_drawn=True)
  File "/home/antony/src/local/mplcairo/lib/mplcairo/base.py", line 261, in get_renderer
    return self._get_cached_or_new_renderer(
  File "/home/antony/src/local/mplcairo/lib/mplcairo/base.py", line 256, in _get_cached_or_new_renderer
    self.figure.draw(renderer)
  File ".../path/to/matplotlib/artist.py", line 74, in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
  File ".../path/to/matplotlib/artist.py", line 51, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File ".../path/to/matplotlib/figure.py", line 2730, in draw
    mimage._draw_list_compositing_images(
  File ".../path/to/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File ".../path/to/matplotlib/_api/deprecation.py", line 447, in wrapper
    return func(*inner_args, **inner_kwargs)
  File ".../path/to/matplotlib/_api/deprecation.py", line 447, in wrapper
    return func(*inner_args, **inner_kwargs)
  File ".../path/to/matplotlib/projections/polar.py", line 994, in draw
    super().draw(renderer, *args, **kwargs)
  File ".../path/to/matplotlib/artist.py", line 51, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File ".../path/to/matplotlib/_api/deprecation.py", line 421, in wrapper
    return func(*inner_args, **inner_kwargs)
  File ".../path/to/matplotlib/axes/_base.py", line 3102, in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
  File ".../path/to/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File ".../path/to/matplotlib/artist.py", line 51, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File ".../path/to/matplotlib/axis.py", line 1124, in draw
    ticks_to_draw = self._update_ticks()
  File ".../path/to/matplotlib/axis.py", line 1011, in _update_ticks
    major_locs = self.get_majorticklocs()
  File ".../path/to/matplotlib/axis.py", line 1243, in get_majorticklocs
    return self.major.locator()
  File ".../path/to/matplotlib/projections/polar.py", line 432, in __call__
    return [tick for tick in self.base() if tick > rorigin]
  File ".../path/to/matplotlib/projections/polar.py", line 432, in __call__
    return [tick for tick in self.base() if tick > rorigin]
  File ".../path/to/matplotlib/ticker.py", line 2265, in __call__
    return self.tick_values(vmin, vmax)
  File ".../path/to/matplotlib/ticker.py", line 2273, in tick_values
    locs = self._raw_ticks(vmin, vmax)
  File ".../path/to/matplotlib/ticker.py", line 2212, in _raw_ticks
    nbins = np.clip(self.axis.get_tick_space(),
  File ".../path/to/matplotlib/axis.py", line 2513, in get_tick_space
    length = ((ends[1][1] - ends[0][1]) / self.axes.figure.dpi) * 72
AttributeError: 'NoneType' object has no attribute 'dpi'