diff --git a/public/react/src/modules/courses/poll/PollNewQuestbank.js b/public/react/src/modules/courses/poll/PollNewQuestbank.js
index c087e4f06..31742ba6d 100644
--- a/public/react/src/modules/courses/poll/PollNewQuestbank.js
+++ b/public/react/src/modules/courses/poll/PollNewQuestbank.js
@@ -539,14 +539,19 @@ class PollNewQuestbank extends Component {
 				}
 				answers.push(answerstwo);
 			}
-			if(anserbool===false){
-				let answersysltwo = {
-					"answer_id": parseInt(object.question.answers[object.question.answers.length-1].answer_id)+1,
-					"answer_position": parseInt(object.question.answers[object.question.answers.length-1].answer_position)+1,
-					"answer_text": "其他"
+			try {
+				if(anserbool===false){
+					let answersysltwo = {
+						"answer_id": parseInt(object.question.answers[object.question.answers.length-1].answer_id)+1,
+						"answer_position": parseInt(object.question.answers[object.question.answers.length-1].answer_position)+1,
+						"answer_text": "其他"
+					}
+					answers.push(answersysltwo);
 				}
-				answers.push(answersysltwo);
+			}catch (e) {
+
 			}
+
 			questiontwo = {
 				"id": object.question.id,
 				"is_necessary": object.question.is_necessary,