diff --git a/attract/tasks/__init__.py b/attract/tasks/__init__.py
index ddf1840..6e5720d 100644
--- a/attract/tasks/__init__.py
+++ b/attract/tasks/__init__.py
@@ -183,7 +183,7 @@ class TaskManager(object):
         register_activity(
             user_id, msg,
             'node', task['_id'],
-            'node', task['parent'] or task['_id'],
+            'node', task.get('parent', None) or task['_id'],
             project_id=task['project'])