diff --git a/plan.py b/plan.py
index 961289d..68ccdb2 100644
--- a/plan.py
+++ b/plan.py
@@ -445,7 +445,6 @@ class Plan(DeactivableMixin, ModelSQL, ModelView):
         else:
             default = default.copy()
         default['products'] = None
-        default['products_tree'] = None
         default['bom'] = None
 
         new_plans = []