diff --git a/controller/Session.class.php b/controller/Session.class.php
index 7ff0a3bf..0da141e6 100644
--- a/controller/Session.class.php
+++ b/controller/Session.class.php
@@ -4,10 +4,6 @@ class Session
 {
     const KEY_DOWNLOAD_ACCESS_ERROR = 'download_error2',
         KEY_DOWNLOAD_ALLOWED = 'beta_download_allowed2',
-        KEY_DEVELOPER_LAST_FORM = 'developer_last_form',
-        KEY_DEVELOPER_CREDITS_ERROR = 'developer_credits_error',
-        KEY_DEVELOPER_CREDITS_WALLET_ADDRESS = 'developer_credits_wallet_address',
-        KEY_DEVELOPER_RETURN_URL_SUCCESS = 'developer_return_url_success',
         KEY_GITHUB_ACCESS_TOKEN = 'github_access_token',
         KEY_LIST_SUB_ERROR = 'list_error',
         KEY_USER_CULTURE = 'user_culture',