diff --git a/system/security.php b/system/security.php
index 661879b..69f37d4 100644
--- a/system/security.php
+++ b/system/security.php
@@ -643,9 +643,10 @@ if(!check_function_exists("check_redirect_origin")) {
 if(!check_function_exists("start_isolated_session")) {
     function start_isolated_session() {
         $cwd = get_current_working_dir();
-        session_save_path($cwd . "/storage/sandbox/sessions");
-        @ini_set("session.save_path", $cwd . "/storage/sandbox/sessions");
-        @ini_set("session.gc_probability", 1); // enable GC(garbage collection)
+        $session_dir = $cwd . "/storage/sandbox/sessions";
+        session_save_path($session_dir);
+        @ini_set("session.save_path", $session_dir);
+        @ini_set("session.gc_probability", 1); // enable gc(gabage collection)
         session_start(); // enable $_SESSION
     }
 }