diff --git a/appserver/web/web-core/src/main/java/org/apache/catalina/session/StandardSession.java b/appserver/web/web-core/src/main/java/org/apache/catalina/session/StandardSession.java
index e1668a69e27..465e6d98ae5 100644
--- a/appserver/web/web-core/src/main/java/org/apache/catalina/session/StandardSession.java
+++ b/appserver/web/web-core/src/main/java/org/apache/catalina/session/StandardSession.java
@@ -1345,10 +1345,10 @@ public Map<String, Object> getAttributes() {
     @Override
     public Enumeration<String> getAttributeNames() {
 
-        if (!isValid())
+        if (!getIsValid()) {
             throw new IllegalStateException
-                ("getAttributeNames: " + RESOURCE_BUNDLE.getString(LogFacade.SESSION_INVALIDATED_EXCEPTION));
-
+              ("getAttributeNames: " + RESOURCE_BUNDLE.getString(LogFacade.SESSION_INVALIDATED_EXCEPTION));
+        }
 
         return (new Enumerator<>(attributes.keySet(), true));