diff --git a/addons/project/project.py b/addons/project/project.py
index 07e22984245..ce0857724cb 100644
--- a/addons/project/project.py
+++ b/addons/project/project.py
@@ -358,7 +358,10 @@ class task(osv.osv):
         """ Gives default stage_id """
         if context is None:
             context = {}
-        return self.stage_find(cr, uid, [], context.get('default_project_id'), [('fold', '=', False)], context=context)
+        default_project_id = context.get('default_project_id')
+        if not default_project_id:
+            return False
+        return self.stage_find(cr, uid, [], default_project_id, [('fold', '=', False)], context=context)
 
     def _read_group_stage_ids(self, cr, uid, ids, domain, read_group_order=None, access_rights_uid=None, context=None):
         if context is None: