From 8fbf167a6f15d5efa2fcd37c9e95bab8cb7b69b2 Mon Sep 17 00:00:00 2001
From: casperlamboo <casperlamboo@gmail.com>
Date: Wed, 13 Dec 2017 14:40:43 +0100
Subject: [PATCH] fix container is undefined error

---
 src/components/App.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/components/App.js b/src/components/App.js
index 6337c81..ed2cde0 100644
--- a/src/components/App.js
+++ b/src/components/App.js
@@ -101,6 +101,7 @@ class App extends React.Component {
   };
 
   componentWillUnmount() {
+    const { container } = this.refs;
     container.removeEventListener('drop', this.onDrop);
   }