From 2299e283169f1668ebbaa179a721f194443a6310 Mon Sep 17 00:00:00 2001
From: Markus <emailaddress@markus-deibel.de>
Date: Tue, 14 Apr 2020 21:11:52 +0200
Subject: [PATCH] Fix undefined topUpLines

---
 apps/batchart/app.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/apps/batchart/app.js b/apps/batchart/app.js
index b81c38790..deb406d8b 100644
--- a/apps/batchart/app.js
+++ b/apps/batchart/app.js
@@ -71,8 +71,11 @@ function loadData() {
     let topUpLogFileName = "bclog" + previousDay;
     let remainingLines = MaxValueCount - dataLines.length;
     let topUpLines = loadLinesFromFile(remainingLines, topUpLogFileName);
-    dataLines = topUpLines.concat(dataLines);
-    
+
+    if(topUpLines) {
+      dataLines = topUpLines.concat(dataLines);
+    }
+
     previousDay = decrementDay(previousDay);
   }