diff --git a/account.py b/account.py
index 52c766a160..e716744a7f 100644
--- a/account.py
+++ b/account.py
@@ -817,6 +817,10 @@ class Account(ModelSQL, ModelView):
         return args2
 
     def copy(self, cursor, user, ids, default=None, context=None):
+        if default is None:
+            default = {}
+        default['left'] = 0
+        default['right'] = 0
         res = super(Account, self).copy(cursor, user, ids, default=default,
                 context=context)
         self._rebuild_tree(cursor, user, 'parent', False, 0)