Comment 9 for bug 1210775

What is the content of the 'group_id' in Magento? Does the call returns it?
Does the call to 'customer.info' returns the expected result as seen here:

>> m.call('customer.info', 1, nil)
=> {"customer_id"=>"1", "created_at"=>"2007-08-30 23:23:13", "updated_at"=>"2008-08-08 12:28:24", "increment_id"=>"000000001", "store_id"=>"1", "website_id"=>"1", "confirmation"=>nil, "created_in"=>nil, "default_billing"=>"274", "default_shipping"=>"274", "disable_auto_group_change"=>"0", "dob"=>nil, "email"=>"<email address hidden>", "firstname"=>"John", "gender"=>nil, "group_id"=>"1", "lastname"=>"Doe", "middlename"=>"", "password_hash"=>"2049484a4020ed15d0e4238db22977d5:eg", "prefix"=>"", "rp_token"=>nil, "rp_token_created_at"=>nil, "suffix"=>"", "taxvat"=>""}

The error indicates that Magento did not returned the 'group_id' field which is mandatory.