error if no university

app/controllers/application_controller.rb

@@ -3,9 +3,15 @@ class ApplicationController < ActionController::Base
   include WithLocale
   include WithDomain
 
-  before_action :authenticate_user!
+  before_action :ensure_university, :authenticate_user!
 
   def breadcrumb
     add_breadcrumb t('home'), root_path
   end
+
+  private
+
+  def ensure_university
+    render_forbidden unless current_university
+  end
 end