junkaixue commented on code in PR #2977:
URL: https://github.com/apache/helix/pull/2977#discussion_r1878685774


##########
helix-core/src/main/java/org/apache/helix/controller/GenericHelixController.java:
##########
@@ -235,7 +235,9 @@ public static GenericHelixController 
getLeaderController(String clusterName) {
     if (clusterName != null) {
       ImmutableSet<GenericHelixController> controllers = 
_helixControllerFactory.get(clusterName);
       if (controllers != null) {
-        return controllers.stream().filter(controller -> 
controller._helixManager.isLeader())
+        return controllers.stream()
+            .filter(controller -> controller._helixManager != null)
+            .filter(controller -> controller._helixManager.isLeader())
             .findAny().orElse(null);

Review Comment:
   Please make sure you load the Helix intellij / eclipse auto code formatter.



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