From 02bb0ab481cdcf26699c901ecdd140d088b7922a Mon Sep 17 00:00:00 2001
From: Marco H <myx00r@googlemail.com>
Date: Sun, 12 Jun 2022 17:46:25 +0200
Subject: [PATCH] Calculate 3h average only if data is available

---
 apps/widbaroalarm/widget.js | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/apps/widbaroalarm/widget.js b/apps/widbaroalarm/widget.js
index 46ac9d480..d8eb43995 100644
--- a/apps/widbaroalarm/widget.js
+++ b/apps/widbaroalarm/widget.js
@@ -171,11 +171,15 @@
     storage.writeJSON(LOG_FILE, history3);
 
     // calculate 3h average for widget
-    let sum = 0;
-    for (let i = 0; i < history3.length; i++) {
-      sum += history3[i]["p"];
+    if (history3.length > 0) {
+      let sum = 0;
+      for (let i = 0; i < history3.length; i++) {
+        sum += history3[i]["p"];
+      }
+      threeHourAvrPressure = sum / history3.length;
+    } else {
+      threeHourAvrPressure = undefined;
     }
-    threeHourAvrPressure = sum / history3.length;
   }