diff --git a/app/controllers/address_search_controller.rb b/app/controllers/address_search_controller.rb
index 616d5b702..90d813d6d 100644
--- a/app/controllers/address_search_controller.rb
+++ b/app/controllers/address_search_controller.rb
@@ -38,7 +38,7 @@ class AddressSearchController < ApplicationController
       address_service.call
       uprn_service.call
 
-      results = ([uprn_service.result] || []) + (address_service.result || [])
+      results = (uprn_service.result.present? ? [uprn_service.result] : []) + (address_service.result.compact.any? ? address_service.result : [])
 
       if address_service.error.present? && uprn_service.error.present?
         render json: { error: "Address and UPRN are not recognised." }, status: :not_found