diff --git a/microsoft_kb/microsoft_kb_checker.rb b/microsoft_kb/microsoft_kb_checker.rb
index f4114ba..30a4577 100644
--- a/microsoft_kb/microsoft_kb_checker.rb
+++ b/microsoft_kb/microsoft_kb_checker.rb
@@ -87,12 +87,16 @@ class MicrosoftKbChecker
   def query_cve
     if os_available?
       response = make_request
-      json = parse_json(response)
-      os_results = select_os(json)
-      if os_results.nil?
-        'Product not found in response data.'
+      if response.code == 200
+        json = parse_json(response)
+        os_results = select_os(json)
+        if os_results.nil?
+          'Product not found in response data.'
+        else
+          kbs_for_os(os_results)
+        end
       else
-        kbs_for_os(os_results)
+        'Problem with HTTP response data.'
       end
     else
       'Operating system not found.'