diff --git a/ruoyi-modules/hwmom-wms/src/main/java/org/dromara/wms/service/impl/WmsInventoryServiceImpl.java b/ruoyi-modules/hwmom-wms/src/main/java/org/dromara/wms/service/impl/WmsInventoryServiceImpl.java
index 5c5c162b..01458c4b 100644
--- a/ruoyi-modules/hwmom-wms/src/main/java/org/dromara/wms/service/impl/WmsInventoryServiceImpl.java
+++ b/ruoyi-modules/hwmom-wms/src/main/java/org/dromara/wms/service/impl/WmsInventoryServiceImpl.java
@@ -422,7 +422,8 @@ public class WmsInventoryServiceImpl implements IWmsInventoryService {
         for (WmsInventoryLedgerVo record : ledgerList) {
             String key = record.getMaterialId() + "_" + record.getBatchCode() + "_" + record.getLocationCode();
             BigDecimal currentBalance = balanceMap.getOrDefault(key, BigDecimal.ZERO);
-            BigDecimal newBalance = currentBalance.add(record.getChangeQty());
+            BigDecimal changeQty = record.getChangeQty() != null ? record.getChangeQty() : BigDecimal.ZERO;
+            BigDecimal newBalance = currentBalance.add(changeQty);
             balanceMap.put(key, newBalance);
             record.setBalanceQty(newBalance);
         }