diff --git a/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/service/impl/EquipmentServiceImpl.java b/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/service/impl/EquipmentServiceImpl.java
index f11767b..6bc24a5 100755
--- a/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/service/impl/EquipmentServiceImpl.java
+++ b/physical-module-system/physical-system-biz/src/main/java/org/jeecg/modules/database/service/impl/EquipmentServiceImpl.java
@@ -2,6 +2,7 @@ package org.jeecg.modules.database.service.impl;
 
 import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
 import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import org.apache.commons.lang3.StringUtils;
 import org.jeecg.modules.database.entity.Equipment;
 import org.jeecg.modules.database.mapper.EquipmentMapper;
 import org.jeecg.modules.database.service.IEquipmentService;
@@ -18,6 +19,9 @@ public class EquipmentServiceImpl extends ServiceImpl<EquipmentMapper, Equipment
 
     @Override
     public Equipment getByManagementNo(String managementNo) {
+        if (StringUtils.isBlank(managementNo)) {
+            return null;
+        }
         return getOne(new LambdaQueryWrapper<Equipment>().eq(Equipment::getManagementNo, managementNo), false);
     }
 }