diff --git a/src/NewWindow.js b/src/NewWindow.js
index 19dbfb2..8a3fa31 100644
--- a/src/NewWindow.js
+++ b/src/NewWindow.js
@@ -102,7 +102,7 @@ class NewWindow extends React.PureComponent {
 
     // Open a new window.
     this.window = window.open(url, name, toWindowFeatures(features))
-    this.container = this.window.document.createElement('div')
+
     // When a new window use content from a cross-origin there's no way we can attach event
     // to it. Therefore, we need to detect in a interval when the new window was destroyed
     // or was closed.