Index: java/org/apache/catalina/valves/PersistentValve.java
===================================================================
--- java/org/apache/catalina/valves/PersistentValve.java	(revision 1005476)
+++ java/org/apache/catalina/valves/PersistentValve.java	(working copy)
@@ -183,9 +183,11 @@
                 } else {
                     if (container.getLogger().isDebugEnabled())
                         container.getLogger().debug("newsessionId store: " + store + " session: " +
-                                session + " valid: " + session.isValid() +
+                                session +
+                                (session == null ? "" 
+                                 : " valid: " + session.isValid() +
                                 " Staled: " +
-                                isSessionStale(session, System.currentTimeMillis()));
+                                isSessionStale(session, System.currentTimeMillis())));
 
                 }
             } else {