Import users error

gistfile1.txt

irb(main):023:0> a = Authentication.new(platform_id: 235, user_id: 13036)

=> #<Authentication id: nil, platform_id: 235, user_id: 13036, receive_newsletter: true, roles_mask: nil, created_at: nil, updated_at: nil, mailchimp_registered: false, accepted_terms: nil, accepted_accredited_terms: nil, meta: nil, additional_fields: {}>

irb(main):024:0> a.save
   (1.9ms)  BEGIN
  Platform Load (1.9ms)  SELECT "platforms".* FROM "platforms" WHERE "platforms"."id" = 235 LIMIT 1
   (1.7ms)  ROLLBACK
   
NoMethodError: undefined method `custom_attributes' for nil:NilClass