diff --git a/xinnengyuan/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/cailiaoshebei/service/impl/BusMrpBaseServiceImpl.java b/xinnengyuan/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/cailiaoshebei/service/impl/BusMrpBaseServiceImpl.java
index 3f337c29..03cb1ad4 100644
--- a/xinnengyuan/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/cailiaoshebei/service/impl/BusMrpBaseServiceImpl.java
+++ b/xinnengyuan/ruoyi-modules/ruoyi-system/src/main/java/org/dromara/cailiaoshebei/service/impl/BusMrpBaseServiceImpl.java
@@ -279,12 +279,12 @@ public class BusMrpBaseServiceImpl extends ServiceImpl<BusMrpBaseMapper, BusMrpB
                 .eq(BusMaterialbatchdemandplan::getSuppliespriceId, suppliespriceId)
                 .ne(mrpBaseId!=null,BusMaterialbatchdemandplan::getMrpBaseId, mrpBaseId)// 排除当前批次
         );
-        if(CollectionUtil.isEmpty(existingList)){
-            return BigDecimal.ZERO;
+        BigDecimal reduce = BigDecimal.ZERO;
+        if(CollectionUtil.isNotEmpty(existingList)){
+            reduce =  existingList.stream()
+                .map(BusMaterialbatchdemandplan::getDemandQuantity)
+                .reduce(BigDecimal.ZERO, BigDecimal::add);
         }
-        BigDecimal reduce = existingList.stream()
-            .map(BusMaterialbatchdemandplan::getDemandQuantity)
-            .reduce(BigDecimal.ZERO, BigDecimal::add);
 
         return byId.getQuantity().subtract(reduce);
     }