Versions: faker 1.4.3 ruby ruby 2.1.3p242 rails 4.0.0

I've been using Faker for a while now without issues. However, I am at the point where I would like to begin validating for string presence/lengths and I am running into an issue with Faker. I currently have a rake task written to generate a bunch of a sample data. Here's a function where I am creating users:

def make_users(agency) 10.times do |n| first_name = Faker::Name.first_name last_name = Faker::Name.last_name email = rand(100).to_s + "" + Faker::Internet.email password = "password1" agency.users.create!( first_name: first_name, last_name: last_name, email: email, password: password, password_confirmation: password) end end

In the model for User, I now require that the user enters a first and last name (as well as other validations for password and email).

validates :first_name, presence: true, length: { maximum: 50 } validates :last_name, presence: true, length: { maximum: 50 }

However, when I run my rake task to generate users, about 10% of the time Faker will try to create a user with an empty first or last name. Because my script creates 10 users, it hardly ever runs without giving me:

ActiveRecord::RecordInvalid: Validation failed: First name can't be blank

or the equivalent error for Last name.

I've Googled around and haven't seen anyone else complain of this.