diff --git a/anytask/tasks/management/commands/send_task_notifications.py b/anytask/tasks/management/commands/send_task_notifications.py
index 86c918ea..74df4ed6 100644
--- a/anytask/tasks/management/commands/send_task_notifications.py
+++ b/anytask/tasks/management/commands/send_task_notifications.py
@@ -44,7 +44,7 @@ def handle(self, **options):
             task_created = False
             task_changed = False
 
-            version_list = Version.objects.get_for_object(task).get_unique()
+            version_list = list(Version.objects.get_for_object(task).get_unique())
 
             task_info = [''] * len(DIFF_FIELDS)
             for i_version, version in enumerate(version_list):