diff --git a/yanzhu-jh/src/main/java/com/yanzhu/jh/device/service/impl/PitmonitSouthsmosDataServiceImpl.java b/yanzhu-jh/src/main/java/com/yanzhu/jh/device/service/impl/PitmonitSouthsmosDataServiceImpl.java
index 21f01e87..15d3df38 100644
--- a/yanzhu-jh/src/main/java/com/yanzhu/jh/device/service/impl/PitmonitSouthsmosDataServiceImpl.java
+++ b/yanzhu-jh/src/main/java/com/yanzhu/jh/device/service/impl/PitmonitSouthsmosDataServiceImpl.java
@@ -127,6 +127,6 @@ public class PitmonitSouthsmosDataServiceImpl implements IPitmonitSouthsmosDataS
     @Override
     public Long monitDays(Long id) {
         Date dt= pitmonitSouthsmosDataMapper.monitDays(id);
-       return  DateUtil.between(new Date(),dt, DateUnit.DAY);
+       return dt==null?0: DateUtil.between(new Date(),dt, DateUnit.DAY);
     }
 }