diff --git a/openerp/addons/base/ir/ir_actions.py b/openerp/addons/base/ir/ir_actions.py
index aab685ef7c8..767ed4b997a 100644
--- a/openerp/addons/base/ir/ir_actions.py
+++ b/openerp/addons/base/ir/ir_actions.py
@@ -899,6 +899,7 @@ class IrActionsServer(models.Model):
 
         eval_context = super(IrActionsServer, self)._get_eval_context(action=action)
         model = self.env[action.model_id.model]
+        obj = None
         if self._context.get('active_model') == action.model_id.model and self._context.get('active_id'):
             obj = model.browse(self._context['active_id'])
         if self._context.get('onchange_self'):