diff --git a/packages/backend/src/server/api/endpoints/notes/state.ts b/packages/backend/src/server/api/endpoints/notes/state.ts
index d0036f0fb7..93517ab10c 100644
--- a/packages/backend/src/server/api/endpoints/notes/state.ts
+++ b/packages/backend/src/server/api/endpoints/notes/state.ts
@@ -59,7 +59,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 				this.noteThreadMutingsRepository.count({
 					where: {
 						userId: me.id,
-						threadId: note.threadId || note.id,
+						threadId: note.threadId ?? note.id,
 					},
 					take: 1,
 				}),