From ecf1a40a5e5501f7c9304aa5fdfc3f1bf79aa895 Mon Sep 17 00:00:00 2001
From: Raphael Michel <michel@rami.io>
Date: Tue, 22 Jun 2021 10:57:34 +0200
Subject: [PATCH] Fix rare crash in async task handling (PRETIXEU-4MB)

---
 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 7220c4d81a..0c0514ce84 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) if res.result else 0
+                'percentage': res.result.get('value', 0) if isinstance(res.result, dict) else 0
             })
         elif res.state == 'STARTED':
             data.update({