Node.js server crash with dns ENOTFOUND error

I have got a Node.js server querying another server every 10 minutes. Sometimes (~once per month) it crashes with following error:

assert.js:85
  throw new assert.AssertionError({
  ^
AssertionError: null == { Error: getaddrinfo ENOTFOUND zso11.edupage.org zso11.edupage.org:80
    at errnoException (dns.js:28:10)
    at GetAddrInfoReq
    at Request._callback (/home/node/substitutions/myModules/zsoServerComunication.js:150:11)
    at self.callback (/home/node/substitutions/node_modules/request/request.js:188:22)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:189:7)
    at Request.onRequestError (/home/node/substitutions/node_modules/request/request.js:884:8)
    at emitOne (events.js:96:13)
    at ClientRequest.emit (events.js:189:7)
    at Socket.socketErrorListener (_http_client.js:358:9)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:189:7)

It happens somewhere here (zsoServerComunication.js):

function getParams(callback){
    var url='http://zso11.edupage.org/substitution/?';
    request(url,function(err,res,body){
        if(!err && res.statusCode ==200){
            getGPIDandGSH(body,function(params){ //line 150
                var cookie=res.headers['set-cookie'];
                var data = {
                    'gpid':params[0],
                    'gsh':params[1],
                    'cookie':cookie
                }
                saveToCollection(['testCollection',data],function(){
                    console.log('data added: '+data);
                })
            });
            //save somewhere
        }
        setImmediate(function() {
            callback();
        });
    });
}

What should I do to fix this error or at least prevent server from crashing?

via Krzysztof Dziembała