gridsearch raising invalid key error

[DifferentiableProgramming]

When using LinearGAM.gridsearch(X, y) on any dataset, e.g. Boston house prices as follows:

from pygam import LinearGAM
from sklearn.datasets import load_boston
boston = load_boston()
X = pd.DataFrame(boston.data, columns=boston.feature_names)
y = pd.Series(boston.target)
gam = LinearGAM(n_splines=10).gridsearch(X, y)

it results in: TypeError: '(slice(None, None, None), 0)' is an invalid key

Will be happy to submit any additional info.

[FerusAndBeyond]

Also got this, the issue seem to be with the pandas dataframe. Simply do:

LinearGAM(n_splines=10).gridsearch(X.values, y.values)

and it works.