我有一個錯誤時，我恢復與eventMsg.entities.hashtags [0] .text區段

Question

執行該代碼時，我得到一個錯誤的Twitter主題標籤：

function TagEvent(eventMsg){ 
var Myname = eventMsg.in_reply_to_screen_name; 
var Hashtag = eventMsg.entities.hashtags[0].text; 
var Isname = eventMsg.user.screen_name; 
var Info = { 
Quote: Myname, 
Sender: Isname, 
UseHashtag: Hashtag 
}; 
console.log(Info); 
if(Myname == 'NameOfMyBot' && Hashtag == 'Pic'){ 
    console.log("correct Hashtag"); 
T.post("statuses/update", {status:'@'+Isname+' reply test '}, tweeted); 


} 

和在CMD誤差爲：

C:\Users\Desktop\picsbot\bot.js:31 
var Hashtag = eventMsg.entities.hashtags[0].text; 
             ^
TypeError: Cannot read property 'text' of undefined 
at StreamingAPIConnection.TagEvent (C:\Users\Desktop\picsbot\bot.js:31:46) 
at emitOne (events.js:96:13) 
at StreamingAPIConnection.emit (events.js:188:7) 
at module.exports.<anonymous> (C:\Users\Desktop\picsbot\node_modules\twit\lib\streaming-api-connection.js:314:56) 
at emitOne (events.js:96:13) 
at module.exports.emit (events.js:188:7) 
at module.exports.Parser.parse (C:\Users\Desktop\picsbot\node_modules\twit\lib\parser.js:47:16) 
at Gunzip.<anonymous> (C:\Users\Desktop\picsbot\node_modules\twit\lib\streaming-api-connection.js:134:21) 
at emitOne (events.js:96:13) 
at Gunzip.emit (events.js:188:7) 
at readableAddChunk (_stream_readable.js:176:18) 
at Gunzip.Readable.push (_stream_readable.js:134:10) 
at Gunzip.Transform.push (_stream_transform.js:128:32) 
at Zlib.callback (zlib.js:584:14) 

但是，推特仍然發佈之前，機器人關機，當我不執行該功能發佈，我沒有錯誤。

Answer 1

變化：

var Hashtag = eventMsg.entities.hashtags[0].text; 

到：

var Hashtag = eventMsg.entities.hashtags[0] && eventMsg.entities.hashtags[0].text;