..

app/controllers/concerns/login_helper.rb

@@ -65,6 +65,7 @@ module LoginHelper
     re_subdomain = "#{request.subdomain.split('.').first}_user_id"
 
     session[:"#{re_subdomain}"] = nil
+    session[:user_id] = nil
     # session[:"#{re_subdomain}"] = user.id
     Rails.logger.info("domain_user_id session is: 3333332222111#{session[:"#{re_subdomain}"]}")
     Rails.logger.info("user_id session is: 3333332222111#{session[:user_id]}")