--- /dev/null
+diff --git a/copanier/views/delivery.py b/copanier/views/delivery.py
+index 779d52c..1696919 100644
+--- a/copanier/views/delivery.py
++++ b/copanier/views/delivery.py
+@@ -401,7 +401,7 @@ async def compute_payments(request, response, id):
+ balance.append((group_id, amount))
+
+ debiters, crediters = order_balance(balance)
+- results = reduce_balance(debiters[:], crediters[:])
++ results = reduce_balance(debiters[:], crediters[:], [])
+
+ results_dict = defaultdict(partial(defaultdict, float))
+