diff --git a/modules/i3plus-ext-mes-pcn-apiservice/src/main/java/cn/estsh/i3plus/ext/mes/pcn/apiservice/serviceimpl/step/MesProductSnGenerateStepService.java b/modules/i3plus-ext-mes-pcn-apiservice/src/main/java/cn/estsh/i3plus/ext/mes/pcn/apiservice/serviceimpl/step/MesProductSnGenerateStepService.java
index 6263be2..50dcc31 100644
--- a/modules/i3plus-ext-mes-pcn-apiservice/src/main/java/cn/estsh/i3plus/ext/mes/pcn/apiservice/serviceimpl/step/MesProductSnGenerateStepService.java
+++ b/modules/i3plus-ext-mes-pcn-apiservice/src/main/java/cn/estsh/i3plus/ext/mes/pcn/apiservice/serviceimpl/step/MesProductSnGenerateStepService.java
@@ -169,7 +169,7 @@ public class MesProductSnGenerateStepService extends BaseStepService {
                 DdlPackBean mesRulePackBean = DdlPackBean.getDdlPackBean(reqBean.getOrganizeCode());
                 DdlPreparedPack.getStringEqualPack(snRule, "ruleCode", mesRulePackBean);
                 List<MesNumberRule> ruleList = mesNumberRuleRao.findByHqlWhere(mesRulePackBean);
-                if (!ruleList.isEmpty()) {
+                if (!ruleList.isEmpty() && !StringUtils.isEmpty(ruleList.get(0).getMethodNameExt())) {
                     MesNumberRule numberRule = ruleList.get(0);
                     String methodNameExt = numberRule.getMethodNameExt();
                     INumberRulePackAttributeStrategy strategy = (INumberRulePackAttributeStrategy)SpringContextsUtil.getBean(methodNameExt);