diff --git a/app/controllers/hack_user_lastest_codes_controller.rb b/app/controllers/hack_user_lastest_codes_controller.rb
index 56cda57d7..fcbecec0d 100644
--- a/app/controllers/hack_user_lastest_codes_controller.rb
+++ b/app/controllers/hack_user_lastest_codes_controller.rb
@@ -103,7 +103,7 @@ class HackUserLastestCodesController < ApplicationController
         if exec_mode == "submit"
           @hack.hack_sets.map{|set| {input: set.input, output: set.output, caseId: set.id}}
         else
-          {input: params[:input]}
+          [{input: params[:input]}]
         end
     testCases = Base64.urlsafe_encode64(test_sets.to_json)
     #codeFileContent = Base64.urlsafe_encode64(@my_hack.code)