ColumnarModelData object without categorical data

I am trying to create a ColumnarModelData object with the function ColumnarModelData.from_data_frame(). One of this function inputs is cat_flds which are the columns in the dataframe which are categorical. However my dataset does not have any categorical column and if I try to pass cat_flds = None there is an error.

Any ideas how to solve this?

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Understanding ColumnarModelData.from_data_frame from Rossman