diff --git a/sf_manufacturing/models/stock.py b/sf_manufacturing/models/stock.py
index 13a4f6e7..c299891e 100644
--- a/sf_manufacturing/models/stock.py
+++ b/sf_manufacturing/models/stock.py
@@ -474,6 +474,8 @@ class ProductionLot(models.Model):
                             [('company_id', '=', company.id), ('product_id', '=', product.id),
                              ('name', 'ilike', product.name.split('[')[0])],
                             limit=1, order='name desc')
+                        if not last_serial:
+                            return "%s-%03d" % (product.name, 1)
                     return self.env['stock.lot'].generate_lot_names1(product.name, last_serial.name, 2)[1]
         now = datetime.now().strftime("%Y%m%d")
         if product.cutting_tool_model_id: