fix minor stack issue

Author: runfaj

Diff for: CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to loose [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.1] - 2020-05-15
+### Fixed
+- An issue with getting target parents if popper unmounted too quickly.
+
 ## [0.5.0] - 2020-05-15
 ### Fixed
 - [#2](https://github.com/runfaj/react-nested-popper/issues/2) - Added position listener to update popper position for nested poppers

Diff for: package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-nested-popper",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "A react library based on popper.js that supports nested poppers and proper context binding.",
   "main": "dist/lib.js",
   "scripts": {

Diff for: src/Stack.js

@@ -240,7 +240,7 @@ export class Stack {
       const items = StackStore[key];
       for (let i = 0; i < items.length; i += 1) {
         const content = items[i];
-        if (content.popperEl.contains(targetRef)) {
+        if (content.popperEl && content.popperEl.contains(targetRef)) {
           foundOne = true;
           foundList[key] = i;
           break;