diff --git a/sale_order_line_input/models/sale_order.py b/sale_order_line_input/models/sale_order.py
index 49ee0c2253b..1359bb1681c 100644
--- a/sale_order_line_input/models/sale_order.py
+++ b/sale_order_line_input/models/sale_order.py
@@ -24,6 +24,15 @@ def _compute_force_company_id(self):
         for line in self:
             line.force_company_id = line.order_id.company_id or self.env.company
 
+    def _compute_name(self):
+        # A NewId is needed to set the product for the parent method to set
+        # the language correctly. Empty id leads to error in ‘_get_lang’.
+        for line in self:
+            if not line.order_id and line.product_id:
+                SaleOrder = self.env["sale.order"]
+                line.order_id = SaleOrder.new({})
+        return super()._compute_name()
+
     @api.onchange("force_company_id")
     def _onchange_force_company_id(self):
         """Assign company_id because is used in domains as partner,
diff --git a/sale_order_line_input/tests/test_sale_order_line_input.py b/sale_order_line_input/tests/test_sale_order_line_input.py
index 9626c1da9d5..ac3cc2317bc 100644
--- a/sale_order_line_input/tests/test_sale_order_line_input.py
+++ b/sale_order_line_input/tests/test_sale_order_line_input.py
@@ -29,3 +29,12 @@ def test_sale_order_create_and_show(self):
         action_dict = line.action_sale_order_form()
         self.assertEqual(action_dict["res_id"], line.order_id.id)
         self.assertEqual(action_dict["res_model"], "sale.order")
+
+    def test_sale_order_line_compute_name(self):
+        # Ensure that when calculating the line name, the new sales order id has
+        # already been created as it is done in the order form view.
+        line_form = Form(
+            self.env["sale.order.line"],
+            view="sale_order_line_input.view_sales_order_line_input_tree",
+        )
+        line_form.product_id = self.product