[tor-bugs] #28294 [Applications]: Nyx crashes at graph resizing

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#28294: Nyx crashes at graph resizing
--------------------------+------------------------------
 Reporter:  wagon         |          Owner:  atagar
     Type:  defect        |         Status:  assigned
 Priority:  Medium        |      Component:  Applications
  Version:  Tor: 0.3.4.8  |       Severity:  Normal
 Keywords:  nyx           |  Actual Points:
Parent ID:                |         Points:
 Reviewer:  atagar        |        Sponsor:
--------------------------+------------------------------
 Nyx (2.0.4 installed using `python3-pip`) has reproducible crash if the
 following is done:

 1. Press `g` for graph resizing.
 2. Press `down arrow` many times until `Events` sub-window will be
 completely hidden.
 3. Nyx crashes with the following log:

 {{{
 Traceback (most recent call last):
   File "/usr/local/bin/nyx", line 9, in <module>
     load_entry_point('nyx==2.0.4', 'console_scripts', 'nyx')()
   File "/usr/local/lib/python3.4/dist-packages/nyx/__init__.py", line 176,
 in main
     nyx.starter.main()
   File "/usr/local/lib/python3.4/dist-packages/stem/util/conf.py", line
 289, in wrapped
     return func(*args, config = config, **kwargs)
   File "/usr/local/lib/python3.4/dist-packages/nyx/starter.py", line 118,
 in main
     nyx.curses.start(nyx.draw_loop, acs_support =
 config.get('acs_support', True), transparent_background = True, cursor =
 False)
   File "/usr/local/lib/python3.4/dist-packages/nyx/curses.py", line 217,
 in start
     curses.wrapper(_wrapper)
   File "/usr/lib/python3.4/curses/__init__.py", line 94, in wrapper
     return func(stdscr, *args, **kwds)
   File "/usr/local/lib/python3.4/dist-packages/nyx/curses.py", line 215,
 in _wrapper
     function()
   File "/usr/local/lib/python3.4/dist-packages/nyx/__init__.py", line 243,
 in draw_loop
     keybinding.handle(key)
   File "/usr/local/lib/python3.4/dist-packages/nyx/panel/__init__.py",
 line 84, in handle
     self._action()
   File "/usr/local/lib/python3.4/dist-packages/nyx/panel/graph.py", line
 504, in _resize_graph
     nyx_interface().redraw()
   File "/usr/local/lib/python3.4/dist-packages/nyx/__init__.py", line 716,
 in redraw
     panel.redraw(force = force, top = occupied)
   File "/usr/local/lib/python3.4/dist-packages/nyx/panel/__init__.py",
 line 175, in redraw
     self._last_draw_size = nyx.curses.draw(self._draw, top = self._top,
 height = self.get_height(), draw_if_resized = draw_dimension)
   File "/usr/local/lib/python3.4/dist-packages/nyx/curses.py", line 740,
 in draw
     curses_subwindow = CURSES_SCREEN.subwin(subwindow_height,
 subwindow_width, top, left)
 _curses.error: curses function returned NULL
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28294>
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