From 5b53f106f14fbb42b9f8ad9c788858db29f252f7 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Thu, 21 Sep 2023 23:27:39 -0500
Subject: [PATCH] check_exam_ticket: filter out revoked tickets

---
 course/exam.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/course/exam.py b/course/exam.py
index e80898955..d573ae23d 100644
--- a/course/exam.py
+++ b/course/exam.py
@@ -515,7 +515,9 @@ def check_exam_ticket(
         if restrict_to_course is not None:
             ticket_kwargs["participation__course"] = restrict_to_course
 
-        ticket = ExamTicket.objects.get(
+        ticket = ExamTicket.objects.exclude(
+                state=exam_ticket_states.revoked
+                ).get(
                 participation__user=user,
                 code=code,
                 **ticket_kwargs