From c73523efc921818191c8bf5f8a9ef9cc0a80310b Mon Sep 17 00:00:00 2001
From: Willem Melching <willem.melching@gmail.com>
Date: Tue, 9 Feb 2021 16:31:54 +0100
Subject: [PATCH] ui.cc: fix divide by zero

old-commit-hash: 2fc1104e8b0158b1dfe43b8788ab2313bb263b41
---
 selfdrive/ui/ui.cc | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/selfdrive/ui/ui.cc b/selfdrive/ui/ui.cc
index b9a232bdf0..d0375c6303 100644
--- a/selfdrive/ui/ui.cc
+++ b/selfdrive/ui/ui.cc
@@ -162,11 +162,16 @@ static void update_sockets(UIState *s) {
   if (sm.updated("ubloxGnss")) {
     auto data = sm["ubloxGnss"].getUbloxGnss();
     if (data.which() == cereal::UbloxGnss::MEASUREMENT_REPORT) {
+
       auto measurements = data.getMeasurementReport().getMeasurements();
-      for (auto m : measurements) {
-        scene.cnoAvg += m.getCno();
+      if (measurements.size()){
+        for (auto m : measurements) {
+          scene.cnoAvg += m.getCno();
+        }
+        scene.cnoAvg /= measurements.size();
+      } else {
+        scene.cnoAvg = 0;
       }
-      scene.cnoAvg /= measurements.size();
       scene.satelliteCount = data.getMeasurementReport().getNumMeas();
     }
   }