diff --git a/src/pretix/api/serializers/order.py b/src/pretix/api/serializers/order.py
index 2569bf513..a03448b77 100644
--- a/src/pretix/api/serializers/order.py
+++ b/src/pretix/api/serializers/order.py
@@ -375,7 +375,7 @@ class OrderPositionSerializer(I18nAwareModelSerializer):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         request = self.context.get('request')
-        if not request or not self.context['request'].query_params.get('pdf_data', 'false') == 'true' or 'can_view_orders' not in request.eventpermset:
+        if request and (not request.query_params.get('pdf_data', 'false') == 'true' or 'can_view_orders' not in request.eventpermset):
             self.fields.pop('pdf_data', None)
 
     def validate(self, data):