diff --git a/activerecord/lib/active_record/query_cache.rb b/activerecord/lib/active_record/query_cache.rb
index fa3e306b3e3ac2ee2cf86a92d9cb0641fb12fc5b..387dd8e9bd36189eeb73f97419dab0c37b3c3a65 100644
--- a/activerecord/lib/active_record/query_cache.rb
+++ b/activerecord/lib/active_record/query_cache.rb
@@ -40,7 +40,7 @@ def self.install_executor_hooks(executor = ActiveSupport::Executor)
       executor.register_hook(self)
 
       executor.to_complete do
-        unless ActiveRecord::Base.connection.transaction_open?
+        unless ActiveRecord::Base.connected? && ActiveRecord::Base.connection.transaction_open?
           ActiveRecord::Base.clear_active_connections!
         end
       end