fixed.js

function _sendInvitationReminder(callback) {
    async.waterfall([
      // 1. Get all invites to be reminded of.
      function(callback) {
        getExternalInvitations(callback);
      },
      // 2. Send out the reminders.
      function(invitations, callback) {
        logger.debug('invites: ' + invitations);
        async.each(invitations, function(invite, inner_callback) {
          // get the user token
          var email = invite.email;
          var emailEscaped = email.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");

          var conditions = {
            email: { $regex: new RegExp('^' + emailEscaped + '$', "i") }
          };
          app.db.models.UserToken.findOne(conditions, function(err, tokenObj) {
            if (err) return inner_callback(err);
            invite.signupToken = tokenObj.token;    // insert token!
            logger.debug("Token is: " + invite.signupToken);
            var daakiyaTemplate = 'cf-v5-problem-invitation';
            // create payload
            var payload = createInvitePayload(app, invite);
            // Invite via daakiya.
            logger.debug("Sending reminder to: " + email.toLowerCase());
            daakiya(app).sendMail(payload, daakiyaTemplate); // make the http call to send out the invite.
            inner_callback();
          });
        }, callback);
      }
    ], // 3. Finally...
      function (err, result) {
        if (err) {
          logger.error("Error: " + err);
          callback(err);
        } else {
          logger.info('Result is: ' + result);
          callback(result);
        }
    });
  }