diff --git a/tryton/gui/window/board.py b/tryton/gui/window/board.py
index 513e62f2fe..2344b01d5b 100644
--- a/tryton/gui/window/board.py
+++ b/tryton/gui/window/board.py
@@ -28,6 +28,7 @@ class Board(SignalEvent):
             self.name = self.board.name
         else:
             self.name = name
+        self.model = ''
 
         self.widget = gtk.VBox()