diff --git a/addons/mrp_bom_cost/models/product.py b/addons/mrp_bom_cost/models/product.py
index fc0f56be631..da15e757cb3 100644
--- a/addons/mrp_bom_cost/models/product.py
+++ b/addons/mrp_bom_cost/models/product.py
@@ -11,11 +11,13 @@ class ProductTemplate(models.Model):
 
     def action_bom_cost(self):
         templates = self.filtered(lambda t: t.product_variant_count == 1 and t.bom_count > 0)
-        return templates.mapped('product_variant_id').action_bom_cost()
+        if templates:
+            return templates.mapped('product_variant_id').action_bom_cost()
 
     def button_bom_cost(self):
         templates = self.filtered(lambda t: t.product_variant_count == 1 and t.bom_count > 0)
-        return templates.mapped('product_variant_id').button_bom_cost()
+        if templates:
+            return templates.mapped('product_variant_id').button_bom_cost()
 
 
 class ProductProduct(models.Model):