From 001b6e4895c59f98f10cf7e8acc4b11eadef4f46 Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Mon, 11 May 2020 15:38:59 +0200
Subject: [PATCH] Fix Dew Point is null

Fix Dew Point is null if either or both Temperature and/ot Humidity is null (#8411)
---
 tasmota/support.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tasmota/support.ino b/tasmota/support.ino
index 5d7d06624..db4c9c26e 100644
--- a/tasmota/support.ino
+++ b/tasmota/support.ino
@@ -638,7 +638,7 @@ float ConvertHumidity(float h)
 
 float CalcTempHumToDew(float t, float h)
 {
-  if (isnan(h) || isnan(t)) { return 0.0; }
+  if (isnan(h) || isnan(t)) { return NAN; }
 
   if (Settings.flag.temperature_conversion) {                 // SetOption8 - Switch between Celsius or Fahrenheit
     t = (t - 32) / 1.8;                                       // Celsius