diff --git a/.github/workflows/moodle-ci.yml b/.github/workflows/moodle-ci.yml
index e24b31c..31a8d43 100644
--- a/.github/workflows/moodle-ci.yml
+++ b/.github/workflows/moodle-ci.yml
@@ -16,7 +16,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:16
+        image: postgres:13
         env:
           POSTGRES_USER: 'postgres'
           POSTGRES_HOST_AUTH_METHOD: 'trust'
diff --git a/lib.php b/lib.php
index 909764c..a389c04 100644
--- a/lib.php
+++ b/lib.php
@@ -119,6 +119,7 @@ function adleradaptivity_delete_instance(int $instance_id): bool {
         $transaction->allow_commit();
     } catch (Exception $e) {
         $logger->error('Could not delete adleradaptivity instance with id ' . $instance_id);
+        $transaction->rollback($e);
         try {
             $transaction->rollback($e);
         } catch (Exception $e) {