From 13ca70da4005f69446f2a0c4ec3da9d5e1547a2f Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Mon, 5 Jan 2026 13:44:02 -0600
Subject: [PATCH] Add safety checks for traffic graph scale calculation

---
 assets/js/app.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/assets/js/app.js b/assets/js/app.js
index 2c7bd6d8..5fe2f0e7 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -107,12 +107,16 @@ const SensorChart = {
         // Find max absolute value to make symmetric scale
         let maxAbsValue = 0
         datasets.forEach(dataset => {
-          dataset.data.forEach(point => {
-            maxAbsValue = Math.max(maxAbsValue, Math.abs(point.y))
-          })
+          if (dataset.data && dataset.data.length > 0) {
+            dataset.data.forEach(point => {
+              if (point && typeof point.y === 'number') {
+                maxAbsValue = Math.max(maxAbsValue, Math.abs(point.y))
+              }
+            })
+          }
         })
-        // Add 10% padding
-        maxAbsValue = maxAbsValue * 1.1
+        // Add 10% padding, ensure minimum of 1000 (1 Kbps)
+        maxAbsValue = Math.max(maxAbsValue * 1.1, 1000)
 
         yAxisConfig = {
           min: -maxAbsValue,