diff --git a/src/domain/blurting/blurting.service.ts b/src/domain/blurting/blurting.service.ts
index ae4e4d6..ac398cf 100644
--- a/src/domain/blurting/blurting.service.ts
+++ b/src/domain/blurting/blurting.service.ts
@@ -462,7 +462,7 @@ export class BlurtingService {
 
   async checkGroupOver(groupId: number): Promise<boolean> {
     const question = await this.blurtingPreQuestionRepository.findOne(groupId, 10);
-    return question.isUploaded;
+    return question && question.isUploaded;
   }
 
   async postAnswer(