diff --git a/product_internal_reference_generator/tests/test_product_internal_reference_generator.py b/product_internal_reference_generator/tests/test_product_internal_reference_generator.py
index 9e69a7c85..4ebd79190 100644
--- a/product_internal_reference_generator/tests/test_product_internal_reference_generator.py
+++ b/product_internal_reference_generator/tests/test_product_internal_reference_generator.py
@@ -22,6 +22,7 @@ def setUpClass(cls):
         cls.val4 = val_model.create({"name": "Magnesium", "attribute_id": cls.attr2.id})
         cls.pt_bicycle = pt_model.create({"name": "Bicycle"})
         cls.pt_car = pt_model.create({"name": "Car"})
+        cls.pt_plane = pt_model.create({"name": "Plane"})
 
     def test_all(self):
         self.assertFalse(self.pt_bicycle.default_code)
@@ -66,3 +67,4 @@ def test_all(self):
         self.assertIn(df, self.pt_car.product_variant_ids[2].default_code)
         df = str(self.pt_seq.sequence_id.number_next_actual - 1) + "006"
         self.assertIn(df, self.pt_car.product_variant_ids[3].default_code)
+        self.assertFalse(self.pt_plane.get_variant_next_default_code())