diff --git a/sdk-service/src/main/java/org/fisco/bcos/sdk/service/GroupServiceImpl.java b/sdk-service/src/main/java/org/fisco/bcos/sdk/service/GroupServiceImpl.java
index d866033b8..4422e8a40 100644
--- a/sdk-service/src/main/java/org/fisco/bcos/sdk/service/GroupServiceImpl.java
+++ b/sdk-service/src/main/java/org/fisco/bcos/sdk/service/GroupServiceImpl.java
@@ -168,11 +168,21 @@ public BigInteger getLatestBlockNumber() {
 
     @Override
     public String getNodeWithTheLatestBlockNumber() {
-        // the case that the sdk is allowed to access all the connected node, select the first
-        // connected node to send the request
-        if (nodeWithLatestBlockNumber.size() > 0) {
-            int random = (int) (Math.random() * (nodeWithLatestBlockNumber.size()));
-            return nodeWithLatestBlockNumber.get(random);
+        try {
+            // the case that the sdk is allowed to access all the connected node, select the first
+            // connected node to send the request
+            if (nodeWithLatestBlockNumber.size() > 0) {
+                // Note: when the nodeWithLatestBlockNumber modified, and the random value
+                // calculated after the modification, and the  nodeWithLatestBlockNumber.get is
+                // called after the modification, this function will throw
+                // ArrayIndexOutOfBoundsException
+                int random = (int) (Math.random() * (nodeWithLatestBlockNumber.size()));
+                return nodeWithLatestBlockNumber.get(random);
+            }
+        } catch (Exception e) {
+            logger.error(
+                    "getNodeWithTheLatestBlockNumber for {}, select the node to send message randomly",
+                    e.getMessage());
         }
         // select the first element
         if (!groupNodeSet.isEmpty()) {