From 14b69e714ae5c3101f61dc68b7720438bf5b2181 Mon Sep 17 00:00:00 2001
From: Juhani Pirttilahti <juhani.pirttilahti@proxion.fi>
Date: Fri, 24 Feb 2023 01:29:26 +0200
Subject: [PATCH] Return null if CIF_speed is not defined (#5)

---
 models/vstp.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/models/vstp.js b/models/vstp.js
index bf359b2..b28b770 100644
--- a/models/vstp.js
+++ b/models/vstp.js
@@ -34,7 +34,12 @@ function parsets(ts) {
 }
 
 function parsespeed(CIF_speed) {
-  const speed = +CIF_speed;
+  // set null if attribute is missing
+  if (CIF_speed === undefined) {
+    return null;
+  }
+  let speed = parseInt(CIF_speed) || 0;
+  // fix speed values in incorrect unit
   switch (speed) {
     case 22:
       return 10;