diff --git a/src/pretix/api/serializers/cart.py b/src/pretix/api/serializers/cart.py
index 6c7f457c2..ecf6b0754 100644
--- a/src/pretix/api/serializers/cart.py
+++ b/src/pretix/api/serializers/cart.py
@@ -235,7 +235,7 @@ class CartPositionCreateSerializer(BaseCartPositionCreateSerializer):
         return cid
 
     def create(self, validated_data):
-        validated_data.pop('sales_channel')
+        validated_data.pop('sales_channel', None)
         addons_data = validated_data.pop('addons', None)
         bundled_data = validated_data.pop('bundled', None)