diff --git a/app/models/metric/chargeback_helper.rb b/app/models/metric/chargeback_helper.rb
index 6ebe59b4a09..806db7cb6fe 100644
--- a/app/models/metric/chargeback_helper.rb
+++ b/app/models/metric/chargeback_helper.rb
@@ -44,7 +44,7 @@ def parents_determining_rate
     when ContainerProject.name
       [parent_ems].compact
     when Container.name
-      [parent_ems]
+      [parent_ems].compact
     end
   end
 end