fix

mec-biz/src/main/java/com/ym/mec/biz/service/impl/VipGroupServiceImpl.java

@@ -2969,7 +2969,7 @@ public class VipGroupServiceImpl extends BaseServiceImpl<Long, VipGroup> impleme
                 }
             }
         } else {
-            if("VIP".equals(vipGroup.getGroupType())){
+            if("VIP".equals(classGroup.getGroupType().getCode())){
                 classGroupDao.modifyStudentNum(classGroup.getId(),-1);
             }
             if (order.getBalancePaymentAmount() != null && order.getBalancePaymentAmount().doubleValue() > 0) {