一次通话正常，但在刷新时中断

Question

我正在对Zomato API进行两个API调用： 1）首先，我从用户输入城市名称，并从API获取Entity_Id和Entity_type参数。 2）我使用entity_Id和entity_type并进行另一个API调用，以从该API获取餐厅数据。

此代码可以正常使用一次，即我打开登录页面并输入城市名称，并显示我要正确显示的内容。

但是，如果我回击并输入另一个城市，则会遇到以下错误，并且我的应用程序崩溃。

我不知道为什么会这样。

var options = {

    url : "https://developers.zomato.com/api/v2.1/",
    headers : {
         "user-key" : "//myAPIKeyHere"
     }
};

app.get("/",function(req, res) {
    res.render("search.ejs");
})

app.get("/restaurants",function(req,res){
    console.log(req.query.search);
    var cityName = req.query.search;

    var cityArray = cityName.split(" ");
    var cityAdd = cityArray[0];
    if(cityArray.length>1){
        for(var i =1;i<cityArray.length;i++){
            cityAdd = cityAdd+"%20"+cityArray[i]
        }
    }

    var ans= new Array();
    options.url = options.url + "locations?query="+cityAdd;

    request(options,function(error, response, body) {
        if(!error && response.statusCode == 200){
            var data = JSON.parse(body);

            ans.push(data["location_suggestions"][0]["entity_id"])
            ans.push(data["location_suggestions"][0]["entity_type"])

            // res.send(ans);
            options.url = "https://developers.zomato.com/api/v2.1/search?entity_id="+ ans[0]+ "&entity_type="+ans[1]+"&sort=rating&order=desc";
            request(options,function(error2,response2,mainBody){
                if(!error2 && response2.statusCode==200){
                    var newdata = JSON.parse(mainBody);
                    res.render("results.ejs",{data:newdata});
                }
                else{
                    console.log(error2);
                    res.send("Error Occured");
                }
            });

        }
        else{
            ans.push(0)
            ans.push(0)
            console.log(error)
            console.log("EERRRRRRRRRRRR")
            return ans

        }
    })
});

错误：

/home/ubuntu/environment/zomato/app.js:40
            ans.push(data["location_suggestions"][0]["entity_id"])
                                                 ^

TypeError: Cannot read property '0' of undefined
    at Request._callback (/home/ubuntu/environment/zomato/app.js:40:50)
    at Request.self.callback (/home/ubuntu/environment/zomato/node_modules/request/request.js:185:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.<anonymous> (/home/ubuntu/environment/zomato/node_modules/request/request.js:1161:10)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:188:7)
    at IncomingMessage.<anonymous> (/home/ubuntu/environment/zomato/node_modules/request/request.js:1083:12)
    at IncomingMessage.g (events.js:292:16)
    at emitNone (events.js:91:20)

通常我每天刷新1000个API调用时，它应该可以工作多次。