diff --git a/sdk-core/src/main/java/io/milvus/param/ConnectParam.java b/sdk-core/src/main/java/io/milvus/param/ConnectParam.java
index fc252ab06..e9d090704 100644
--- a/sdk-core/src/main/java/io/milvus/param/ConnectParam.java
+++ b/sdk-core/src/main/java/io/milvus/param/ConnectParam.java
@@ -491,6 +491,9 @@ public Builder withRpcDeadline(long deadline, TimeUnit timeUnit) {
          * @return <code>Builder</code>
          */
         public Builder withAuthorization(String username, String password) {
+            if (username == null || username.trim().isEmpty()) {
+                throw new IllegalArgumentException("Username cannot be null or blank");
+            }
             this.authorization = Base64.getEncoder().encodeToString(String.format("%s:%s", username, password).getBytes(StandardCharsets.UTF_8));
             this.userName = username;
             return this;
diff --git a/sdk-core/src/main/java/io/milvus/v2/client/ConnectConfig.java b/sdk-core/src/main/java/io/milvus/v2/client/ConnectConfig.java
index 1c9e69b8c..68883130b 100644
--- a/sdk-core/src/main/java/io/milvus/v2/client/ConnectConfig.java
+++ b/sdk-core/src/main/java/io/milvus/v2/client/ConnectConfig.java
@@ -354,6 +354,9 @@ public ConnectConfigBuilder token(String token) {
         }
 
         public ConnectConfigBuilder username(String username) {
+            if (username == null || username.trim().isEmpty()) {
+                throw new IllegalArgumentException("Username cannot be null or blank");
+            }
             this.username = username;
             return this;
         }