From e11ad583cb0990c062e6364a9de6070a84bbf860 Mon Sep 17 00:00:00 2001
From: Hugo LEVY-FALK <klafyvel@gmail.com>
Date: Tue, 5 Feb 2019 19:43:17 +0100
Subject: [PATCH] =?UTF-8?q?Mise=20=C3=A0=200=20du=20solde=20quand=20pas=20?=
 =?UTF-8?q?de=20vente?=
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---
 comet/account/models.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/comet/account/models.py b/comet/account/models.py
index d042805..3ef2878 100644
--- a/comet/account/models.py
+++ b/comet/account/models.py
@@ -19,7 +19,7 @@ class Account(models.Model):
         """Adjust the ballance according to the sales,
         without saving the model."""
         self.balance = Sale.objects.filter(account=self)\
-            .aggregate(models.Sum('price'))['price__sum']
+            .aggregate(models.Sum('price'))['price__sum'] or 0
 
 
 class Sale(models.Model):