diff --git a/decidim-census/app/services/census_authorization_handler.rb b/decidim-census/app/services/census_authorization_handler.rb
index da2e93b5..6fa2526c 100644
--- a/decidim-census/app/services/census_authorization_handler.rb
+++ b/decidim-census/app/services/census_authorization_handler.rb
@@ -50,7 +50,7 @@ def unique_id
   end
 
   def scope
-    Decidim::Scope.find(scope_id)
+    Decidim::Scope.find_by_id(scope_id)
   end
 
   def census_for_user