Error in extract_collection_schema method

[urbanrotnik]

I am trying to add a column with the add_property method but it returns an error. I am getting the same error when I call rows on collection.

irb(main):004:0> notion_page.add_property('TEST', 'url')
Traceback (most recent call last):
        2: from (irb):3
        1: from (irb):4:in `rescue in irb_binding'
NoMethodError (undefined method `[]' for nil:NilClass)
irb(main):005:0>

Looks like POST request in extract_collection_schema is invalid, it is returning validation error.

response.body
"{\"errorId\":\"83f22b07-f9c5-4247-a2bf-96c20799a974\",\"name\":\"ValidationError\",\"message\":\"Invalid input.\"}"