diff --git a/object.js b/object.js
index 1af65c5..b421cda 100755
--- a/object.js
+++ b/object.js
@@ -118,7 +118,7 @@ var deepKeys =
 module.deepKeys =
 function(obj, stop){
 	var res = []
-	while(obj !== stop && obj != null){
+	while(obj!= null && obj.__proto__ !== stop){
 		res.push(Object.keys(obj))
 		obj = obj.__proto__ }
 	return [...(new Set(res.flat()))] }
diff --git a/package.json b/package.json
index 2be819c..ca87d9b 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ig-object",
-  "version": "5.0.9",
+  "version": "5.0.10",
   "description": "",
   "main": "object.js",
   "scripts": {