From e412d46f5c527d38b19bf334fef153a2b8064fae Mon Sep 17 00:00:00 2001
From: Fen Dweller <chemicalcrux@gmail.com>
Date: Mon, 23 Apr 2018 16:55:55 -0400
Subject: [PATCH] Fixed number fields without units causing errors

---
 game.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/game.js b/game.js
index 2d60ecf..ccfc512 100644
--- a/game.js
+++ b/game.js
@@ -3415,7 +3415,12 @@ function updatePreview(name) {
   if (scale == "")
     scale = document.getElementById("scale").placeholder;
 
-  let value = document.getElementById(name).value;
+  let element = document.getElementById(name);
+
+  if (element == undefined)
+    return;
+
+  let value = element.value;
   let unitType = document.getElementById(name).dataset.unit;
 
   if (value == "")
@@ -3423,6 +3428,9 @@ function updatePreview(name) {
 
   let result = "";
 
+  if (unitType == undefined)
+    return;
+
   if (unitType == "length")
     result = length(value * scale, unit);
   else if (unitType == "area")