diff --git a/product/ERP5Type/Core/Folder.py b/product/ERP5Type/Core/Folder.py
index f15639c500fda0f02cadc776db12747403b70764..abaeaaa83e65f22707b9ce813fa1f1dfcca6b2a0 100644
--- a/product/ERP5Type/Core/Folder.py
+++ b/product/ERP5Type/Core/Folder.py
@@ -839,6 +839,8 @@ class Folder(CopyContainer, CMFBTreeFolder, CMFHBTreeFolder, Base, FolderMixIn,
     if self._folder_handler == HBTREE_HANDLER:
       return CMFHBTreeFolder.__getattr__(self, name)
     else:
+      if self._tree is None:
+        raise AttributeError, name
       return CMFBTreeFolder.__getattr__(self, name)
     
   def __len__(self):