From 27769347283e6881ee2a15bf0c558f9866403425 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Acid=20Chicken=20=28=E7=A1=AB=E9=85=B8=E9=B6=8F=29?=
 <root@acid-chicken.com>
Date: Fri, 15 Feb 2019 23:42:44 +0900
Subject: [PATCH] Update is-objectid.ts (#4277)

* Update is-objectid.ts

* Update is-objectid.ts
---
 src/misc/is-objectid.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/misc/is-objectid.ts b/src/misc/is-objectid.ts
index c3148a7785..a77c4ee2d5 100644
--- a/src/misc/is-objectid.ts
+++ b/src/misc/is-objectid.ts
@@ -1,5 +1,5 @@
 import { ObjectID } from 'mongodb';
 
 export default function(x: any): x is ObjectID {
-	return x.hasOwnProperty('toHexString') || x.hasOwnProperty('_bsontype');
+	return x && typeof x === 'object' && (x.hasOwnProperty('toHexString') || x.hasOwnProperty('_bsontype'));
 }