diff --git a/app/libs/util/redis.rb b/app/libs/util/redis.rb
index 3acd1cef7..f240406f5 100644
--- a/app/libs/util/redis.rb
+++ b/app/libs/util/redis.rb
@@ -2,7 +2,7 @@ module Util::Redis
   class << self
     def online_user_count
       if Rails.cache.is_a?(ActiveSupport::Cache::RedisStore)
-        Rails.cache.data.scan(0, match: 'cache:_session_id:*', count: 100000).last.size
+        Rails.cache.data.scan(0, match: 'cache:_session_id:*', count: 100000).last.uniq.size
       end
     end
   end