diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb
index 4ba35fe513cfff70932b60aa1586c5ff3afdf99e..5464ca60660aa1a8928d22344523e95852c6d490 100644
--- a/activerecord/lib/active_record/railtie.rb
+++ b/activerecord/lib/active_record/railtie.rb
@@ -149,8 +149,10 @@ class Railtie < Rails::Railtie # :nodoc:
 
       ActiveSupport.on_load(:active_record) do
         ActionDispatch::Reloader.send(hook) do
-          ActiveRecord::Base.clear_reloadable_connections!
-          ActiveRecord::Base.clear_cache!
+          if ActiveRecord::Base.connected?
+            ActiveRecord::Base.clear_reloadable_connections!
+            ActiveRecord::Base.clear_cache!
+          end
         end
       end
     end