Index: RepositoryBrowser.cpp
===================================================================
--- RepositoryBrowser.cpp	(revision 16998)
+++ RepositoryBrowser.cpp	(working copy)
@@ -3448,7 +3528,8 @@
 
 void CRepositoryBrowser::InvalidateData (HTREEITEM node, const SVNRev& revision)
 {
-    CTreeItem * pItem = (CTreeItem *)m_RepoTree.GetItemData (node);
+    CTreeItem * pItem = NULL;
+    if (node != NULL) pItem = (CTreeItem *)m_RepoTree.GetItemData (node);
     if (pItem == NULL)
         m_lister.Refresh (revision);
     else