From a9075429eb64d46bd2f4aa1e3dfea3d0a432d52d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Mon, 9 Apr 2012 17:04:30 +0200
Subject: [PATCH] Fix graph when y field is None

issue2530
---
 tryton/gui/window/view_form/view/graph_gtk/graph.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tryton/gui/window/view_form/view/graph_gtk/graph.py b/tryton/gui/window/view_form/view/graph_gtk/graph.py
index fb05b4fb8d..c90173ef85 100644
--- a/tryton/gui/window/view_form/view/graph_gtk/graph.py
+++ b/tryton/gui/window/view_form/view/graph_gtk/graph.py
@@ -371,7 +371,7 @@ class Graph(gtk.DrawingArea):
                     self.datas[x][key] += 1
                 else:
                     self.datas[x][key] += \
-                            float(model[yfield['name']].get(model))
+                            float(model[yfield['name']].get(model) or 0)
         if isinstance(minx, datetime.datetime):
             date = minx
             while date <= maxx: