vldpyatkov commented on code in PR #4701:
URL: https://github.com/apache/ignite-3/pull/4701#discussion_r1837907609


##########
modules/replicator/src/main/java/org/apache/ignite/internal/raft/client/TopologyAwareRaftGroupService.java:
##########
@@ -337,10 +337,14 @@ public CompletableFuture<Void> 
subscribeLeader(LeaderElectionListener callback)
 
                 refreshAndGetLeaderWithTerm().thenAcceptAsync(leaderWithTerm 
-> {
                     if (!leaderWithTerm.isEmpty()) {
-                        serverEventHandler.onLeaderElected(
-                                
clusterService.topologyService().getByConsistentId(leaderWithTerm.leader().consistentId()),
-                                leaderWithTerm.term()
-                        );
+                        ClusterNode leaderHost = 
clusterService.topologyService().getByConsistentId(leaderWithTerm.leader().consistentId());
+
+                        if (leaderHost != null) {

Review Comment:
   I would print a warning here.



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