diff --git a/src/server/api/endpoints/users/groups/transfer.ts b/src/server/api/endpoints/users/groups/transfer.ts
index 3baa182abf..ca0ab9ab29 100644
--- a/src/server/api/endpoints/users/groups/transfer.ts
+++ b/src/server/api/endpoints/users/groups/transfer.ts
@@ -74,7 +74,7 @@ export default define(meta, async (ps, me) => {
 		userId: user.id
 	});
 
-	if (!joining) {
+	if (joining == null) {
 		throw new ApiError(meta.errors.noSuchGroupMember);
 	}