zero-size array to reduction operation minimum which has no identity

pthon报错：zero-size array to reduction operation minimum which has no identity请问这是为什么

原代码如下：
dataWOE = data[short_list_2]
corr = round(dataWOE.corr(),2)

mask = np.zeros_like(corr, dtype=np.bool)
mask[np.triu_indices_from(mask)] = True

plt.figure(figsize = (5, 5))
cmap = sns.diverging_palette(220, 10, as_cmap=True)
sns.heatmap(corr, mask=mask, cmap=cmap, center=0, annot =True, cbar_kws={"shrink": .5})
plt.show()