diff --git a/app/controllers/public/account_controller.rb b/app/controllers/public/account_controller.rb
index 5be1f93..9a356a5 100644
--- a/app/controllers/public/account_controller.rb
+++ b/app/controllers/public/account_controller.rb
@@ -359,11 +359,11 @@ class AccountController < ApplicationController
   end
 
   def get_signup_start_time
-    Rails.cache.read params[:signup_time_key] if params[:signup_time_key]
+    Rails.cache.read params[:signup_time_key] if params[:signup_time_key].present?
   end
 
   def clear_signup_start_time
-    Rails.cache.delete params[:signup_time_key] if params[:signup_time_key]
+    Rails.cache.delete params[:signup_time_key] if params[:signup_time_key].present?
   end
 
   def may_be_a_bot
--
libgit2 0.21.2