error

Traceback (most recent call last):
  File "C:/Users/dmnte/PycharmProjects/graph/project.py", line 30, in <module>
    update_graph()
  File "C:/Users/dmnte/PycharmProjects/graph/project.py", line 26, in update_graph
    win.after(20000, update_graph())
  File "C:/Users/dmnte/PycharmProjects/graph/project.py", line 26, in update_graph
    win.after(20000, update_graph())
  File "C:/Users/dmnte/PycharmProjects/graph/project.py", line 26, in update_graph
    win.after(20000, update_graph())
  [Previous line repeated 959 more times]
  File "C:/Users/dmnte/PycharmProjects/graph/project.py", line 25, in update_graph
    fig.canvas.draw()
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 9, in draw
    super(FigureCanvasTkAgg, self).draw()
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\backends\backend_agg.py", line 402, in draw
    self.figure.draw(self.renderer)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\figure.py", line 1652, in draw
    renderer, self, artists, self.suppressComposite)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axes\_base.py", line 2604, in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\image.py", line 138, in _draw_list_compositing_images
    a.draw(renderer)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\artist.py", line 50, in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 1197, in draw
    self._update_label_position(renderer)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 2307, in _update_label_position
    bboxes, bboxes2 = self._get_tick_boxes_siblings(renderer=renderer)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 2291, in _get_tick_boxes_siblings
    ticks_to_draw = axx.yaxis._update_ticks(renderer)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 1023, in _update_ticks
    tick_tups = list(self.iter_ticks())  # iter_ticks calls the locator
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 967, in iter_ticks
    majorLocs = self.major.locator()
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\ticker.py", line 1985, in __call__
    return self.tick_values(vmin, vmax)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\ticker.py", line 1993, in tick_values
    locs = self._raw_ticks(vmin, vmax)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\ticker.py", line 1932, in _raw_ticks
    nbins = np.clip(self.axis.get_tick_space(),
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 2539, in get_tick_space
    tick = self._get_tick(True)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 2194, in _get_tick
    return YTick(self.axes, 0, '', major=major, **tick_kw)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 174, in __init__
    self.tick1line = self._get_tick1line()
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\axis.py", line 595, in _get_tick1line
    zorder=self._zorder)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\lines.py", line 386, in __init__
    self._marker = MarkerStyle(marker, fillstyle)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\markers.py", line 245, in __init__
    self.set_marker(marker)
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\matplotlib\markers.py", line 302, in set_marker
    elif (isinstance(marker, Sized) and len(marker) in (2, 3) and
  File "C:\Users\dmnte\AppData\Local\Programs\Python\Python37-32\lib\abc.py", line 139, in __instancecheck__
    return _abc_instancecheck(cls, instance)
RecursionError: maximum recursion depth exceeded in comparison