diff --git a/object.js b/object.js
index b421cda..0ac7036 100755
--- a/object.js
+++ b/object.js
@@ -118,9 +118,11 @@ var deepKeys =
 module.deepKeys =
 function(obj, stop){
 	var res = []
-	while(obj!= null && obj.__proto__ !== stop){
+	while(obj!= null){
 		res.push(Object.keys(obj))
-		obj = obj.__proto__ }
+		obj = obj.__proto__ 
+		if(obj === stop){
+			break }}
 	return [...(new Set(res.flat()))] }
 
 
diff --git a/package.json b/package.json
index ca87d9b..3955a8a 100755
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ig-object",
-  "version": "5.0.10",
+  "version": "5.0.11",
   "description": "",
   "main": "object.js",
   "scripts": {