diff --git a/backend/classes/controller/FingerprintPostController.php b/backend/classes/controller/FingerprintPostController.php
index 19daa57..df31e39 100644
--- a/backend/classes/controller/FingerprintPostController.php
+++ b/backend/classes/controller/FingerprintPostController.php
@@ -17,6 +17,7 @@ final class FingerprintPostController extends AbstractController
         $db = new MySqlDatabase();
         $json = json_decode($this->requestBody);
         $fingerprint = new Fingerprint(null, $db);
+		$this->response = new ApiJsonResponse();
 
         try {
             $fingerprint->setFingerprint($json->fingerprint);
@@ -36,13 +37,10 @@ final class FingerprintPostController extends AbstractController
 
             $this->response->setParameter('fingerprintId', $fingerprint->getFingerprintId());
         } catch (QrCodeException $e) {
-            $db->rollback();
-
+        	$this->response->setStatus(ServerStatus::INTERNAL_ERROR);
             $this->response->setParameter('success', false);
-            $this->response->setStatus(ServerStatus::INTERNAL_ERROR);
-            $this->response->setMessage('An error occured during qr code creation!');
+            $this->response->setMessage('An error occured during QR code creation!');
         } catch (Throwable $e) {
-            $db->rollback();
             $this->catchDatabaseException($e->getMessage(), $json);
         }
     }