diff --git a/exam-module-exam/exam-module-exam-biz/src/main/java/pc/exam/pp/module/exam/service/monitor/MonitorServiceImpl.java b/exam-module-exam/exam-module-exam-biz/src/main/java/pc/exam/pp/module/exam/service/monitor/MonitorServiceImpl.java
index f2ecf979..1bfe9dde 100644
--- a/exam-module-exam/exam-module-exam-biz/src/main/java/pc/exam/pp/module/exam/service/monitor/MonitorServiceImpl.java
+++ b/exam-module-exam/exam-module-exam-biz/src/main/java/pc/exam/pp/module/exam/service/monitor/MonitorServiceImpl.java
@@ -115,6 +115,9 @@ public class MonitorServiceImpl implements MonitorService {
         public long getStuMonitor(StuMonitorPaperVo stuMonitorPaperVo) {
                 String key = "userCache:"+stuMonitorPaperVo.getTaskId()+":" + stuMonitorPaperVo.getStuId();
              MonitorDO info = JsonUtils.parseObject(stringRedisTemplate.opsForValue().get(key),MonitorDO.class);
+             if (info==null){
+                     return  0L;
+             }
                 if (StringUtils.isNotBlank(stuMonitorPaperVo.getPaperId())){
                         EducationPaper educationPaper = educationPaperMapper.selectEducationPaperByPaperId(stuMonitorPaperVo.getPaperId());
                         String counts = educationPaper.getCounts();
@@ -199,7 +202,7 @@ public class MonitorServiceImpl implements MonitorService {
 
                                 info.setRemainingTime((long) examTime.toLocalTime().toSecondOfDay());
                                 stringRedisTemplate.opsForValue().set("userCache:"+stuMonitorPaperVo.getTaskId()+":"+stuMonitorPaperVo.getStuId(), JsonUtils.toJsonString(info));
-
+                                monitorMapper.updateById(info);
 
                                 return (long) examTime.toLocalTime().toSecondOfDay();