Resolve "Ilias Schnittstelle: studip_referrer.php springt nicht mehr in Ilias Objekte (Ilias 8)"

Closes #5617

Merge request studip/studip!4231

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/ilias_interface/studip_referrer_8x.php b/lib/ilias_interface/studip_referrer_8x.php
index 6db0b32..62b17a6 100644
--- a/lib/ilias_interface/studip_referrer_8x.php
+++ b/lib/ilias_interface/studip_referrer_8x.php
@@ -119,8 +119,9 @@ if(file_exists("./ilias.ini.php")){
     }
     if ($base_url)
     {
-        $ref_id = array_key_exists('ref_id', $_GET) ? $_GET['ref_id'] : '';
-        $base_url .= "&ref_id=".(int)$ref_id;
+        if (!empty($_GET['ref_id'])) {
+            $base_url .= "&ref_id=" . (int)$_GET['ref_id'];
+        }
         $token_repository = new ilCtrlTokenRepository();
         $token = $token_repository->getToken();
         $base_url .= '&' . ilCtrlInterface::PARAM_CSRF_TOKEN . '=' . $token->getToken();