[dubbo] 02/02: fix potential NPE

[liujun]

This is an automated email from the ASF dual-hosted git repository.

liujun pushed a commit to branch 3.0-metadata-refactor
in repository https://gitbox.apache.org/repos/asf/dubbo.git

commit 924e0bc1cf2467541653ab0af77707c905c2ffe6
Author: ken.lj <ken.lj...@gmail.com>
AuthorDate: Tue Nov 23 13:23:22 2021 +0800

    fix potential NPE
---
 .../apache/dubbo/registry/client/migration/model/MigrationRule.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git 
a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/migration/model/MigrationRule.java
 
b/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/migration/model/MigrationRule.java
index 8dc97f7..9a4c689 100644
--- 
a/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/migration/model/MigrationRule.java
+++ 
b/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/client/migration/model/MigrationRule.java
@@ -164,8 +164,10 @@ public class MigrationRule {
             if (CollectionUtils.isNotEmpty(services)) {
                 for (String service : services) {
                     SubMigrationRule rule = applicationRules.get(service);
-                    if (rule.getStep() != null) {
-                        return rule.getStep();
+                    if (rule != null) {
+                        if (rule.getStep() != null) {
+                            return rule.getStep();
+                        }
                     }
                 }
             }