26ef892b062e300c602a79ff7c378564c49d4848,wicket-core/src/main/java/org/apache/wicket/page/PersistentPageManager.java,SessionEntry,writeObject,#ObjectOutputStream#,211
Before Change
List<Serializable> l = new ArrayList<Serializable>();
for (IManageablePage p : pages)
{
Serializable preparedPage = getPageStore().prepareForSerialization(sessionId, p);
if (preparedPage != null)
{
l.add(preparedPage);
After Change
// prepare for serialization and store the pages
List<Serializable> l = new ArrayList<Serializable>();
IPageStore pageStore = getPageStore();
for (IManageablePage p : pages)
{
Serializable preparedPage;
if (pageStore != null)
{
preparedPage = pageStore.prepareForSerialization(sessionId, p);
}