--- jakarta-tomcat-5.0.28-src/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/session/StandardManager.java	2004-08-29 02:14:08.000000000 +0200
+++ jakarta-tomcat-5.0.28-src/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/session/StandardManager.java	2005-12-16 02:38:00.765625000 +0100
@@ -534,6 +534,11 @@ 
                 while (elements.hasNext()) {
                     StandardSession session =
                         (StandardSession) elements.next();
+                    if( session.isValid() == false ) {
+                       if (log.isDebugEnabled())
+                           log.debug("Ignoring invalid session: "+session);
+                         continue;
+                    }
                     list.add(session);
                     ((StandardSession) session).passivate();
                     session.writeObjectData(oos);