From 975c13a7cfaf25d811475823824af3a9c04b0ba8 Mon Sep 17 00:00:00 2001
From: xiaofen9 <f3i@t00ls.net>
Date: Mon, 30 Dec 2019 09:37:11 -0800
Subject: [PATCH] fix type checking vul in ctorName

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index aa2bb39..bdcfdc8 100644
--- a/index.js
+++ b/index.js
@@ -66,7 +66,7 @@ module.exports = function kindOf(val) {
 };
 
 function ctorName(val) {
-  return val.constructor ? val.constructor.name : null;
+  return val.constructor && typeof val.constructor === 'function' ? val.constructor.name : null;
 }
 
 function isArray(val) {