diff --git a/packages/backend/src/server/api/endpoints/notes/search.ts b/packages/backend/src/server/api/endpoints/notes/search.ts
index 8c5798b62d..ca64017fa4 100644
--- a/packages/backend/src/server/api/endpoints/notes/search.ts
+++ b/packages/backend/src/server/api/endpoints/notes/search.ts
@@ -75,9 +75,11 @@ export default define(meta, paramDef, async (ps, me) => {
 			ps.untilId,
 		);
 
-		if (ps.userId) {
+		if (ps.userId != null) {
 			query.andWhere("note.userId = :userId", { userId: ps.userId });
-		} else if (ps.channelId) {
+		}
+
+		if (ps.channelId != null) {
 			query.andWhere("note.channelId = :channelId", {
 				channelId: ps.channelId,
 			});