unhandled exception

var http = require('http');
var zlib = require('zlib');
var Db = require('mongodb').Db,
    Connection = require('mongodb').Connection,
    Server = require('mongodb').Server,
    BSON = require('mongodb').BSONNative;

var k = 1;
var cronJob = require('cron').CronJob;
var job = new cronJob('*/5 * * * * *', function(){

  var db = new Db('xForum', new Server('localhost', Connection.DEFAULT_PORT, {forceServerObjectId: true}));
  var request = http.get({
                         host: 'www.earthempires.com',
                         path: '/news_feed?apicode=edited_out_for_privacy',
                         port: 80,
                         headers: { 'accept-encoding': 'gzip' } });


  request.on('response', function(response) {
    if (response.statusCode == 200){
      switch (response.headers['content-encoding']) {
        case 'gzip':
          var gunzip = zlib.createGunzip();
          var data = "";
          response.pipe(gunzip);
          gunzip.on('data', function(chunk) {
            data += chunk;
          });
          gunzip.on('end', function() {
            db.open(function(err, db) {
              if (err){
                console.log("error:" + err);
              }
              db.collection('news', function(err, collection) {

                console.log("collection: news" + k);
                k++;

                data = data.split('\n');
                data.forEach(function(line) {
                  line = line.split(',');

                  if (line.length != 15) {
                     return;
                  };

                  var new_rank = {
                      serverid: line[0],
                      resetid: line[1],
                      newsid: line[2],
                      timestamp: line[3]*1000,
                      type: line[4],
                      win: line[5],
                      attacker_num: line[6],
                      attacker_name: line[7],
                      defender_num: line[8],
                      defender_name: line[9],
                      result1: line[10],
                      result2: line[11],
                      a_tag: line[12],
                      d_tag: line[13],
                      killhit: line[14]
                  };
                  collection.insert(new_rank);
                });
              });
            });
          });

      }
    }
  });

  request.on('error', function(error){
    console.log(error);
    console.log("hmph");
  });
}, null, true);