Jedi crash

[deoplete] Traceback (most recent call last):
  File "/home/user/.local/share/nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/child.py", line 179, in _gather_results
    result = self._get_result(context, source)
  File "/home/user/.local/share/nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/child.py", line 234, in _get_result
    ctx['candidates'] = source.gather_candidates(ctx)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi/profiler.py", line 37, in wrapper
    return func(self, *args, **kwargs)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi.py", line 170, in gather_candidates
    completions = self.get_completions(script)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi/profiler.py", line 37, in wrapper
    return func(self, *args, **kwargs)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi.py", line 123, in get_completions
    return script.completions()
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/__init__.py", line 179, in completions
    completions = completion.completions()
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/completion.py", line 98, in completions
    completion_names = self._get_context_completions()
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/completion.py", line 126, in _get_context_completions
    grammar, self._code_lines, self._module_node, self._position
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/helpers.py", line 133, in get_stack_at_position
    raise SystemError("This really shouldn't happen. There's a bug in Jedi.")
SystemError: This really shouldn't happen. There's a bug in Jedi.
Error from jedi: SystemError("This really shouldn't happen. There's a bug in Jedi.").  Use :messages / see above for error details.
[deoplete] Traceback (most recent call last):
  File "/home/user/.local/share/nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/child.py", line 179, in _gather_results
    result = self._get_result(context, source)
  File "/home/user/.local/share/nvim/plugged/deoplete.nvim/rplugin/python3/deoplete/child.py", line 234, in _get_result
    ctx['candidates'] = source.gather_candidates(ctx)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi/profiler.py", line 37, in wrapper
    return func(self, *args, **kwargs)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi.py", line 170, in gather_candidates
    completions = self.get_completions(script)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi/profiler.py", line 37, in wrapper
    return func(self, *args, **kwargs)
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/sources/deoplete_jedi.py", line 123, in get_completions
    return script.completions()
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/__init__.py", line 179, in completions
    completions = completion.completions()
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/completion.py", line 98, in completions
    completion_names = self._get_context_completions()
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/completion.py", line 126, in _get_context_completions
    grammar, self._code_lines, self._module_node, self._position
  File "/home/user/.local/share/nvim/plugged/deoplete-jedi/rplugin/python3/deoplete/vendored/jedi/jedi/api/helpers.py", line 133, in get_stack_at_position
    raise SystemError("This really shouldn't happen. There's a bug in Jedi.")
SystemError: This really shouldn't happen. There's a bug in Jedi.
Error from jedi: SystemError("This really shouldn't happen. There's a bug in Jedi.").  Use :messages / see above for error details.