diff --git a/microsoft_kb/microsoft_kb_checker.rb b/microsoft_kb/microsoft_kb_checker.rb
index b74c4dd..f4114ba 100644
--- a/microsoft_kb/microsoft_kb_checker.rb
+++ b/microsoft_kb/microsoft_kb_checker.rb
@@ -89,7 +89,11 @@ class MicrosoftKbChecker
       response = make_request
       json = parse_json(response)
       os_results = select_os(json)
-      kbs_for_os(os_results) if os_results
+      if os_results.nil?
+        'Product not found in response data.'
+      else
+        kbs_for_os(os_results)
+      end
     else
       'Operating system not found.'
     end
@@ -102,12 +106,12 @@ class MicrosoftKbChecker
   end
 
   def kbs_for_os(os_json)
-    supersedence = os_json.values_at('supersedence')
+    supersedence = os_json.dig('supersedence')
     articles = article_title_keys(os_json)
     kbs = articles.map do |article_info|
       num = article_info[:article_num]
       os_json.values_at("articleTitle#{num}")
-    end
+    end.flatten.reject! { |kb| kb == '' }
     {
       os_name: os_json['name'],
       kbs: kbs,