..

app/controllers/main_controller.rb

@@ -20,7 +20,10 @@ class MainController < ApplicationController
       uid_logger("main start is #{cookies[:_educoder_session]}")
     end
 
-    if params[:path].split("/").first == "h5"
+
+
+    if params[:path] && params[:path].split("/").first == "educoderh5"
+
       render file: 'public/h5build/index.html', :layout => false
     end