submit：

zhongzheng-api/src/main/java/com/zhongzheng/controller/bank/QuestionController.java

@@ -1,5 +1,6 @@
 package com.zhongzheng.controller.bank;
 
+import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;
 import com.zhongzheng.common.core.controller.BaseController;
 import com.zhongzheng.common.core.domain.AjaxResult;
 import com.zhongzheng.common.core.page.TableDataInfo;
@@ -129,7 +130,7 @@ public class QuestionController extends BaseController {
             if (!CollectionUtils.isEmpty(paperVos)){
                 Map<Long, List<ExamPaperVo>> map = paperVos.stream().collect(Collectors.groupingBy(ExamPaperVo::getGoodsId));
                 map.forEach((k,v) -> {
-                    ArrayList<ExamPaperVo> vos = v.stream().collect(Collectors.collectingAndThen(Collectors
+                    ArrayList<ExamPaperVo> vos = v.stream().filter(x -> ObjectUtils.isNotNull(x.getPaperId())).collect(Collectors.collectingAndThen(Collectors
                             .toCollection(() -> new TreeSet<>(Comparator.comparing(item -> item.getPaperId()))), ArrayList::new));
                     map.put(k,vos);
                 });