diff --git a/lib/tasks/build_update_pull_request_data.rake b/lib/tasks/build_update_pull_request_data.rake
index b66b4d90..ff59c7e6 100644
--- a/lib/tasks/build_update_pull_request_data.rake
+++ b/lib/tasks/build_update_pull_request_data.rake
@@ -4,7 +4,8 @@ namespace :build do
       require 'travis'
       Travis::Database.connect
 
-      Build.pull_requests.includes(:request).find_in_batches do |builds|
+      Build.pull_requests.where('pull_request_number IS NULL OR pull_request_title IS NULL').
+            includes(:request).find_in_batches do |builds|
         Build.transaction do
           builds.each do |build|
             attrs = {