diff --git a/uptime_kuma_api/api.py b/uptime_kuma_api/api.py
index 1721bde..8687a43 100644
--- a/uptime_kuma_api/api.py
+++ b/uptime_kuma_api/api.py
@@ -792,7 +792,7 @@ class UptimeKumaApi(object):
             accepted_statuscodes = ["200-299"]
 
         if notificationIDList is None:
-            notificationIDList = {}
+            notificationIDList = []
 
         data = {
             "type": type,