Return null SSL session on zero length array
diff --git a/java/org/apache/tomcat/util/net/jsse/JSSESupport.java b/java/org/apache/tomcat/util/net/jsse/JSSESupport.java
index 059cf77..d4438f6 100644
--- a/java/org/apache/tomcat/util/net/jsse/JSSESupport.java
+++ b/java/org/apache/tomcat/util/net/jsse/JSSESupport.java
@@ -170,7 +170,7 @@
         }
         // Expose ssl_session (getId)
         byte [] ssl_session = session.getId();
-        if ( ssl_session == null) {
+        if (ssl_session == null || ssl_session.length == 0) {
             return null;
         }
         StringBuilder buf=new StringBuilder();