diff --git a/plexpy/notification_handler.py b/plexpy/notification_handler.py
index 7c16de00..57f5ff83 100644
--- a/plexpy/notification_handler.py
+++ b/plexpy/notification_handler.py
@@ -985,8 +985,8 @@ def build_media_notify_params(notify_action=None, session=None, timeline=None, m
         'product': notify_params['product'],
         'player': notify_params['player'],
         'ip_address': notify_params.get('ip_address', 'N/A'),
-        'started_datestamp': arrow.get(notify_params['started']).format(date_format),
-        'started_timestamp': arrow.get(notify_params['started']).format(time_format),
+        'started_datestamp': arrow.get(notify_params['started']).format(date_format) if notify_params['started'] else '',
+        'started_timestamp': arrow.get(notify_params['started']).format(time_format) if notify_params['started'] else '',
         'started_unixtime': notify_params['started'],
         'stopped_datestamp': arrow.get(notify_params['stopped']).format(date_format) if notify_params['stopped'] else '',
         'stopped_timestamp': arrow.get(notify_params['stopped']).format(time_format) if notify_params['stopped'] else '',