diff --git a/app/controllers/managements_controller.rb b/app/controllers/managements_controller.rb
index 384839e0..0f0b1252 100644
--- a/app/controllers/managements_controller.rb
+++ b/app/controllers/managements_controller.rb
@@ -29,7 +29,7 @@ class ManagementsController < ApplicationController
   end
 
   def user_agents
-    @user_agents = UserAgent.joins("JOIN users u ON u.login = user_agents.key").where("user_agents.key is not null and is_delete = 0 and u.login is not null").order("created_at desc")
+    @user_agents = UserAgent.where("user_agents.key is not null and is_delete = 0").order("created_at desc")
     @agents_count = @user_agents.count
     limit = 20
     @agents_pages = Paginator.new @agents_count, limit, params['page'] || 1
diff --git a/app/views/managements/_user_agent_list.html.erb b/app/views/managements/_user_agent_list.html.erb
index 286d0f6a..1876d3ef 100644
--- a/app/views/managements/_user_agent_list.html.erb
+++ b/app/views/managements/_user_agent_list.html.erb
@@ -13,6 +13,7 @@
   <tbody>
   <% @user_agents.each do |ua| %>
     <% user = User.find_by_login(ua.key)  %>
+    <% next if user.nil? %>
     <% user_extension = user&.user_extensions %>
     <% school = user_extension&.school %>
     <tr>