ActiveRecord::RecordInvalid already taken (token already exists) about doorkeeper-jwt HOT 2 CLOSED

Doorkeeper::JWT.configure do
  # Set the payload for the JWT token. This should contain unique information
  # about the user.
  # Defaults to a randomly generated token in a hash
  # { token: "RANDOM-TOKEN" }
  token_payload do |opts|
    user = User.find(opts[:resource_owner_id])
    {
      exp: (opts[:created_at] + opts[:expires_in]).utc.to_i,
      iss: "api.yourcooldomain.com",
      iat: opts[:created_at].utc.to_i, 
      jti: SecureRandom.uuid,
      sub: user.id,
      user: {
        id: user.id,
        name: user.name,
        email: user.email,
        email_md5: user.email_md5,
        admin: user.admin?
      }
    }
  end

  # Use the application secret specified in the Access Grant token
  # Defaults to false
  # If you specify `use_application_secret true`, both secret_key and secret_key_path will be ignored
  use_application_secret true

  # Set the encryption secret. This would be shared with any other applications
  # that should be able to read the payload of the token.
  # Defaults to "secret"
  secret_key Rails.application.secrets.secret_key_base

  # If you want to use RS* encoding specify the path to the RSA key
  # to use for signing.
  # If you specify a secret_key_path it will be used instead of secret_key
  # secret_key_path "path/to/file.pem"

  # Specify encryption type. Supports any algorithim in
  # https://github.com/progrium/ruby-jwt
  # defaults to nil
  encryption_method :hs512
end