diff --git a/main.js b/main.js
index 7ec574ad..f6e8caa2 100644
--- a/main.js
+++ b/main.js
@@ -116,7 +116,6 @@ app.on("ready", () => {
     }
     readerWindow.on("close", () => {
       readerWindow.destroy();
-      readerWindow = null;
     });
     event.returnValue = "success";
   });