diff --git a/adminstuds.php b/adminstuds.php
index c4f3c89..9c7ac25 100644
--- a/adminstuds.php
+++ b/adminstuds.php
@@ -90,12 +90,13 @@ function sendUpdateNotification($poll, $mailService, $type) {
 if (!empty($_GET['poll'])) {
     $admin_poll_id = filter_input(INPUT_GET, 'poll', FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => POLL_REGEX]]);
     if (strlen($admin_poll_id) === 24) {
-        $poll_id = substr($admin_poll_id, 0, 16);
         $poll = $pollService->findByAdminId($admin_poll_id);
     }
 }
 
-if (!$poll) {
+if ($poll) {
+    $poll_id = $poll->id;
+} else {
     $smarty->assign('error', __('Error', 'This poll doesn\'t exist !'));
     $smarty->display('error.tpl');
     exit;