From 186a1b3f4c38b5327052ba1bbe85d2eaf19704b0 Mon Sep 17 00:00:00 2001
From: Aadit Kamat <aadit.k12@gmail.com>
Date: Sat, 19 Sep 2020 23:27:09 +0800
Subject: [PATCH] Fix backspace crash

---
 src/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 5317efb..68430c0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -187,7 +187,7 @@ class App extends React.Component {
         const r = parseInt(e.target.value, 10);
         // Text inputs can sometimes temporarily be in invalid states.
         // If it's not a valid number, refuse to set it.
-        if (typeof r !== "undefined") {
+        if (!isNaN(r)) {
           this.setState({[state_key]: r});
         }
       };