csvstat gives me "'NoneType' object has no attribute 'decimal_formats'" error for tutorial data

Created by: suewonjp

Whenever I try csvstat for the tutorial data, I get the following error and it just stops wherever it detects the error

$ csvstat data.csv

  1. "state"

        Type of data:          Text
        Contains null values:  False
        Unique values:         1
        Most common values:    NE (1036x)

  2. "county"

        Type of data:          Text
        Contains null values:  False
        Unique values:         35
        Most common values:    DOUGLAS (760x)
                               DAKOTA (42x)
                               CASS (37x)
                               HALL (23x)
                               LANCASTER (18x)

  3. "fips"

        Type of data:          Number
        Contains null values:  False
        Unique values:         35
'NoneType' object has no attribute 'decimal_formats'
        Most common values:   

My environment:

OS X 10.11.6

python version : 2.7.10

pip version : 9.0.1

I installed csvkit via pip yesterday (Apr 8th)

Any idea?