diff --git a/addons/stock/models/stock_picking.py b/addons/stock/models/stock_picking.py
index defeb0ffdc0..4e295000523 100644
--- a/addons/stock/models/stock_picking.py
+++ b/addons/stock/models/stock_picking.py
@@ -624,6 +624,7 @@ class Picking(models.Model):
         }
 
     def action_toggle_is_locked(self):
+        self.ensure_one()
         self.is_locked = not self.is_locked
         return True