diff --git a/index.php b/index.php
index 399d757..5a93fa8 100644
--- a/index.php
+++ b/index.php
@@ -400,7 +400,12 @@ switch (true) {
         exit;
         
     case preg_match('/^\/ticket\.php/', $requestPath) && isset($_GET['id']):
-        header("Location: /ticket/" . $_GET['id']);
+        $legacyId = (string)$_GET['id'];
+        if (ctype_digit($legacyId) && (int)$legacyId > 0) {
+            header("Location: /ticket/" . $legacyId);
+        } else {
+            header("Location: /");
+        }
         exit;
         
     default: