update

src/main/java/com/free/service/HistoryService.java

@@ -25,7 +25,7 @@ public class HistoryService extends ServiceImpl<HistoryMapper, History> {
   public List<Map> getQuestionsName(List<History> list) {
     List<Map> returnData = new ArrayList<>();
     for (History i : list) {
-      Question q = questionService.getById(i.getId());
+      Question q = questionService.getById(i.getQuestion_id());
       if (null == q) {
         continue;
       }