diff --git a/addons/product/models/product_template.py b/addons/product/models/product_template.py
index 437c193446b..2b2508cce9d 100644
--- a/addons/product/models/product_template.py
+++ b/addons/product/models/product_template.py
@@ -368,14 +368,7 @@ class ProductTemplate(models.Model):
     @api.multi
     def create_variant_ids(self):
         Product = self.env["product.product"]
-
         for tmpl_id in self.with_context(active_test=False):
-            # list of values combination
-            existing_variants = [set(variant.attribute_value_ids.ids) for variant in tmpl_id.product_variant_ids]
-            variant_matrix = itertools.product(*(line.value_ids for line in tmpl_id.attribute_line_ids if line.value_ids and line.value_ids[0].attribute_id.create_variant))
-            variant_matrix = map(lambda record_list: reduce(lambda x, y: x+y, record_list, self.env['product.attribute.value']), variant_matrix)
-            to_create_variants = filter(lambda rec_set: set(rec_set.ids) not in existing_variants, variant_matrix)
-
             # adding an attribute with only one value should not recreate product
             # write this attribute on every product to make sure we don't lose them
             variant_alone = tmpl_id.attribute_line_ids.filtered(lambda line: len(line.value_ids) == 1).mapped('value_ids')
@@ -383,6 +376,12 @@ class ProductTemplate(models.Model):
                 updated_products = tmpl_id.product_variant_ids.filtered(lambda product: value_id.attribute_id not in product.mapped('attribute_value_ids.attribute_id'))
                 updated_products.write({'attribute_value_ids': [(4, value_id.id)]})
 
+            # list of values combination
+            existing_variants = [set(variant.attribute_value_ids.ids) for variant in tmpl_id.product_variant_ids]
+            variant_matrix = itertools.product(*(line.value_ids for line in tmpl_id.attribute_line_ids if line.value_ids and line.value_ids[0].attribute_id.create_variant))
+            variant_matrix = map(lambda record_list: reduce(lambda x, y: x+y, record_list, self.env['product.attribute.value']), variant_matrix)
+            to_create_variants = filter(lambda rec_set: set(rec_set.ids) not in existing_variants, variant_matrix)
+
             # check product
             variants_to_activate = self.env['product.product']
             variants_to_unlink = self.env['product.product']