diff --git a/endpoint.php b/endpoint.php
index 5333fde..87002bf 100644
--- a/endpoint.php
+++ b/endpoint.php
@@ -262,6 +262,12 @@ function invalidRequest(): void
         header('HTTP/1.1 200 OK');
         exit();
     }
+    $me = filter_input_array(INPUT_GET, [
+        'me' => FILTER_VALIDATE_URL,
+    ]);
+    if (!isset($me)) {
+        invalidRequest();
+    }
     $request = array_merge(
         filter_input_array(INPUT_POST, [
             'grant_type' => [
@@ -275,9 +281,7 @@ function invalidRequest(): void
             'client_id' => FILTER_VALIDATE_URL,
             'redirect_uri' => FILTER_VALIDATE_URL,
         ]),
-        filter_input_array(INPUT_GET, [
-            'me' => FILTER_VALIDATE_URL,
-        ])
+        $me
     );
     if (in_array(null, $request, true) || in_array(false, $request, true)) {
         invalidRequest();