diff --git a/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts b/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
index 8cf9ce8fb0..8993237421 100644
--- a/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
+++ b/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
@@ -93,7 +93,7 @@ export default define(meta, paramDef, async (ps, me) => {
 
 	try {
 		if (ps.tag) {
-			if (!safeForSql(ps.tag)) throw new Error("Injection");
+			if (!safeForSql(normalizeForSearch(ps.tag))) throw 'Injection';
 			query.andWhere(`'{"${normalizeForSearch(ps.tag)}"}' <@ note.tags`);
 		} else {
 			query.andWhere(
@@ -102,7 +102,7 @@ export default define(meta, paramDef, async (ps, me) => {
 						qb.orWhere(
 							new Brackets((qb) => {
 								for (const tag of tags) {
-									if (!safeForSql(tag)) throw new Error("Injection");
+									if (!safeForSql(normalizeForSearch(ps.tag))) throw 'Injection';
 									qb.andWhere(`'{"${normalizeForSearch(tag)}"}' <@ note.tags`);
 								}
 							}),