python 跑voronoi函数 报错 'NoneType' object has no attribute 'close'

import numpy as np
from scipy.spatial import Voronoi
points=np.array([[0, 0],[0, 1],[0, 2],
                    [1, 0],[1, 1],[1, 2],
                    [2, 0],[2, 1],[2, 2]])
vor = Voronoi(points)

 vor = Voronoi(points)
AttributeError: 'NoneType' object has no attribute 'close'
Traceback (most recent call last):