diff --git a/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/KyuubiConnection.java b/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/KyuubiConnection.java
index 8b6c8f50d..16347771d 100644
--- a/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/KyuubiConnection.java
+++ b/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/KyuubiConnection.java
@@ -930,7 +930,7 @@ public class KyuubiConnection implements SQLConnection, KyuubiLoggable {
       AccessControlContext context = AccessController.getContext();
       return Subject.getSubject(context);
     } else if (isTgtCacheAuthMode()) {
-      String ticketCache = sessConfMap.get(AUTH_KYUUBI_CLIENT_TICKET_CACHE);
+      String ticketCache = sessConfMap.getOrDefault(AUTH_KYUUBI_CLIENT_TICKET_CACHE, "");
       return KerberosAuthenticationManager.getTgtCacheAuthentication(ticketCache).getSubject();
     } else {
       // This should never happen
diff --git a/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/auth/KerberosAuthenticationManager.java b/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/auth/KerberosAuthenticationManager.java
index 6a639c7d6..065b6a295 100644
--- a/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/auth/KerberosAuthenticationManager.java
+++ b/kyuubi-hive-jdbc/src/main/java/org/apache/kyuubi/jdbc/hive/auth/KerberosAuthenticationManager.java
@@ -17,6 +17,8 @@
 
 package org.apache.kyuubi.jdbc.hive.auth;
 
+import static java.util.Objects.requireNonNull;
+
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -29,6 +31,7 @@ public class KerberosAuthenticationManager {
       new ConcurrentHashMap<>();
 
   public static CachingKerberosAuthentication getTgtCacheAuthentication(String ticketCache) {
+    requireNonNull(ticketCache, "ticketCache is null");
     return TGT_CACHE_AUTHENTICATION_CACHE.computeIfAbsent(
         ticketCache,
         key -> {