diff --git a/v25/storage/dbstorage.py b/v25/storage/dbstorage.py
index 2ad82fe..62af5dc 100644
--- a/v25/storage/dbstorage.py
+++ b/v25/storage/dbstorage.py
@@ -342,7 +342,7 @@ class DBStorage(PushStorage):
 
     @staticmethod
     def pushsubscription(subscription: dict):
-        assert run(["node", "v25pushx/push.js"], input=json.dumps({
+        assert not run(["node", "v25pushx/push.js"], input=json.dumps({
             "subscription": subscription,
             "notification": {
                 "notification": {