Improve db migrations for notification settings

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/db/migrate/20160328115649_migrate_new_notification_setting.rb b/db/migrate/20160328115649_migrate_new_notification_setting.rb
index 331c35535f2..aff866b5f46 100644
--- a/db/migrate/20160328115649_migrate_new_notification_setting.rb
+++ b/db/migrate/20160328115649_migrate_new_notification_setting.rb
@@ -4,7 +4,7 @@
 class MigrateNewNotificationSetting < ActiveRecord::Migration
   def up
     timestamp = Time.now
-    execute "INSERT INTO notification_settings ( user_id, source_id, source_type, level, created_at, updated_at ) SELECT user_id, source_id, source_type, notification_level, '#{timestamp}', '#{timestamp}' FROM members"
+    execute "INSERT INTO notification_settings ( user_id, source_id, source_type, level, created_at, updated_at ) SELECT user_id, source_id, source_type, notification_level, '#{timestamp}', '#{timestamp}' FROM members WHERE user_id IS NOT NULL"
   end
 
   def down