diff --git a/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java b/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
index c5b53a77721..df9b86649bc 100644
--- a/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
+++ b/broker/src/main/java/org/apache/rocketmq/broker/out/BrokerOuterAPI.java
@@ -86,7 +86,7 @@ public void shutdown() {
     public String fetchNameServerAddr() {
         try {
             String addrs = this.topAddressing.fetchNSAddr();
-            if (addrs != null) {
+            if (addrs != null && !UtilAll.isBlank(addrs)) {
                 if (!addrs.equals(this.nameSrvAddr)) {
                     log.info("name server address changed, old: {} new: {}", this.nameSrvAddr, addrs);
                     this.updateNameServerAddressList(addrs);
diff --git a/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java b/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java
index 5d7e1685e83..bec1a568456 100644
--- a/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java
+++ b/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java
@@ -227,7 +227,7 @@ public RemotingClient getRemotingClient() {
     public String fetchNameServerAddr() {
         try {
             String addrs = this.topAddressing.fetchNSAddr();
-            if (addrs != null) {
+            if (addrs != null && !UtilAll.isBlank(addrs)) {
                 if (!addrs.equals(this.nameSrvAddr)) {
                     log.info("name server address changed, old=" + this.nameSrvAddr + ", new=" + addrs);
                     this.updateNameServerAddressList(addrs);