diff --git a/lib/webPush.js b/lib/webPush.js
index d28ab8bb..c697afd5 100644
--- a/lib/webPush.js
+++ b/lib/webPush.js
@@ -259,7 +259,7 @@ export const notifyItemParents = async ({ models, item }) => {
       )
       AND EXISTS (
         -- check that there is at least one parent subscribed to this thread
-        SELECT 1 FROM "ThreadSubscription" ts WHERE p.id = ts."itemId"
+        SELECT 1 FROM "ThreadSubscription" ts WHERE p.id = ts."itemId" AND p."userId" = ts."userId"
       )`
     await Promise.allSettled(
       parents.map(({ userId, isDirect }) => {