From fb2827e9ab183725aa2dff9a648c1e550b39b363 Mon Sep 17 00:00:00 2001
From: Raphael Michel <michel@rami.io>
Date: Fri, 11 Jun 2021 18:09:12 +0200
Subject: [PATCH] AsyncMixin: Fix occasional crash (PRETIXEU-49P)

---
 src/pretix/base/views/tasks.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pretix/base/views/tasks.py b/src/pretix/base/views/tasks.py
index 91b34a3b26..7220c4d81a 100644
--- a/src/pretix/base/views/tasks.py
+++ b/src/pretix/base/views/tasks.py
@@ -106,7 +106,7 @@ class AsyncMixin:
         elif res.state == 'PROGRESS':
             data.update({
                 'started': True,
-                'percentage': res.result.get('value', 0)
+                'percentage': res.result.get('value', 0) if res.result else 0
             })
         elif res.state == 'STARTED':
             data.update({