From abdc25bbd4090c3e9b75aa33d4e72a180c68cb35 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicolas=20=C3=89vrard?= <nicoe@b2ck.com>
Date: Fri, 3 Jun 2016 13:02:55 +0200
Subject: [PATCH] Check self.id against None before comparing to 0

issue5590
review23151002
---
 sale.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sale.py b/sale.py
index f1328b49ce..85f91fc204 100644
--- a/sale.py
+++ b/sale.py
@@ -32,7 +32,7 @@ class SaleLine:
         pattern = super(SaleLine, self)._get_tax_rule_pattern()
 
         from_country, to_country = None, None
-        if self.id < 0:
+        if self.id is None or self.id < 0:
             warehouse = self.get_warehouse('warehouse')
             if warehouse:
                 warehouse = Location(warehouse)