From c42db76553957b0d6587966f4bd1d37c58536bc3 Mon Sep 17 00:00:00 2001
From: Michele Azzolari <michele@azzolari.it>
Date: Wed, 10 Oct 2018 10:22:02 +0200
Subject: [PATCH] Fixes #14

---
 assets/app.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/assets/app.js b/assets/app.js
index 5a6cd2d..cd5ab3c 100644
--- a/assets/app.js
+++ b/assets/app.js
@@ -41,6 +41,7 @@ const getTemplateHtml = template => {
 
 const valueChange = value => {
     const iframehtml = document.getElementById('iframe').contentWindow.document.getElementById(value);
+    if(!iframehtml) return;
     const val = document.getElementById(value).value;
     iframehtml.innerHTML = val
 };