From 9da77f73ffc9322e99f8b1ec59e463540f4f256d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Mon, 4 Feb 2013 20:05:15 +0100
Subject: [PATCH] unit or product could be None

issue2976
review659002
---
 invoice.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/invoice.py b/invoice.py
index 0ccfde4931..e028b87503 100644
--- a/invoice.py
+++ b/invoice.py
@@ -1914,7 +1914,7 @@ class InvoiceLine(ModelSQL, ModelView):
             res[field] = getattr(self, field)
 
         for field in ('unit', 'product', 'account'):
-            res[field] = getattr(self, field).id
+            res[field] = getattr(getattr(self, field), 'id', None)
 
         res['taxes'] = []
         if self.taxes: