Stripe POST that fails, sends two POSTS, second fails

exports.charge = function(req, res){
  var pkg = req.body;
  var token = pkg.token;
  console.log("POST BODY");
  console.log(req.body);

  var charge = rk.stripe.charges.create({
    amount: 3999, // amount in cents, again
    currency: "usd",
    card: token.id,
    description: "Payment to My Teen Driver from " + token.email
  }, function(err, charge_response) {
    console.log("Response from Stripe:");
    if (err) {
      if (err.type === 'StripeCardError') {
        // The card has been declined
      }
      console.log(err);
      res.send(err);
    } else {
      console.log("CHARGE RESPONSE");
      console.log(charge_response);
      //res.send(charge_response);
      //TODO: refactor this assingment out if not necessary
      var stripe_charge = charge_response;

      var user = rk.db.User.create({
        name: stripe_charge.card.name,
        email: token.email,
        address_line1: stripe_charge.card.address_line1,
        address_line2: stripe_charge.card.address_line2,
        address_city: stripe_charge.card.address_city,
        address_state: stripe_charge.card.address_state,
        address_zip: stripe_charge.card.address_zip,
        address_country: stripe_charge.card.address_country
      }).success(function(user){
        //res.send(user);
        //TODO: assign code
        var charge = rk.db.Charge.create({
          user_id: user.id,
          charge_id: stripe_charge.id,
          token_id: token.id,
          name: stripe_charge.card.name,
          card_id: stripe_charge.card.id,
          card_type: stripe_charge.card.type,
          card_last4: stripe_charge.card.last4,
          card_fingerprint: stripe_charge.card.fingerprint,
          card_exp_month: stripe_charge.card.exp_month,
          card_exp_year: stripe_charge.card.exp_year,
          created: stripe_charge.created,
          currency: stripe_charge.currency,
          description: stripe_charge.description,
          paid: stripe_charge.paid,
          amount: stripe_charge.amount
        }).success(function(charge_model){
          //TODO: update something?
          //STRIPE POSTS TWICE CAUSING ERROR
          res.send(user, charge_model);
        });

      });
    }
  });

}