diff --git a/src/main/java/com/aliyun/oss/common/auth/STSAssumeRoleSessionCredentialsProvider.java b/src/main/java/com/aliyun/oss/common/auth/STSAssumeRoleSessionCredentialsProvider.java
index f3b2dd37..348d59b2 100644
--- a/src/main/java/com/aliyun/oss/common/auth/STSAssumeRoleSessionCredentialsProvider.java
+++ b/src/main/java/com/aliyun/oss/common/auth/STSAssumeRoleSessionCredentialsProvider.java
@@ -84,7 +84,10 @@ public Credentials getCredentials() {
         if (credentials == null || credentials.willSoonExpire()) {
             synchronized (this) {
                 if (credentials == null || credentials.willSoonExpire()) {
-                    credentials = getNewSessionCredentials();
+                    BasicCredentials newCredentials = getNewSessionCredentials();
+                    if(newCredentials != null) {
+                        credentials = newCredentials;
+                    }
                 }
             }
         }