Alexa HTTP Post not working as intended

I'm developing an Alexa Skill which has to do POST request to a REST api. When testing my POST-Function locally it's working like a charm, but when I deploy my package as Lambda-Function I have to invoke the skill twice (or more times) before the request is send. Is my POST-Function implementation wrong or do I miss something in the skill itself?

'use strict';
 var Alexa = require('alexa-sdk');
 var http = require( 'http' );

exports.handler = function(event, context, callback) {

var alexa = Alexa.handler(event, context);
alexa.APP_ID = APP_ID;
alexa.registerHandlers(handlers);
alexa.execute();
};


var handlers = {
'LaunchRequest': function () {
    this.emit('GetFact');
},
'GetNewFactIntent': function () {
    this.emit('GetFact');
},
'SendSMSIntent': function () {
    this.emit('SendSMS');
},'SendSMS': function () {
    console.log('=====   SMS  =====');
    // Create speech output
    var speechOutput = "SEND SMS";
    postRequest('Message','Recipient','4657114258','SMS');

    this.emit(':tellWithCard', speechOutput, SKILL_NAME)
},
'AMAZON.HelpIntent': function () {
    var speechOutput = "";
    var reprompt = "What can I help you with?";
    this.emit(':ask', speechOutput, reprompt);
},
'AMAZON.CancelIntent': function () {
    this.emit(':tell', 'Bye!');
},
'AMAZON.StopIntent': function () {
    this.emit(':tell', 'Bye!');
}
};

function postRequest(m,r,u,t){
  console.log('=====  POST REQUEST  =====');
  var request = require('request');
  request.post(
  'Server.com',
  { json: { 'Message' : m,'Recipient' : r ,'UserID': u, 'Type': t  } },
  function (error, response, body) {
     if (!error && response.statusCode == 200) {
         console.log(body)
         }
     }
   );

 }

via user3042626