From a530051bbd7d846d6672310bf293b6635529595a Mon Sep 17 00:00:00 2001
From: Jean-Marc Collin <jm.collin.78@gmail.com>
Date: Mon, 14 Oct 2024 19:29:34 +0200
Subject: [PATCH] FIX #518 TypeError: unsupported operand type(s) for -: 'int'
 and 'NoneType' (#559)

Co-authored-by: Jean-Marc Collin <jean-marc.collin-extern@renault.com>
---
 custom_components/versatile_thermostat/thermostat_climate.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/custom_components/versatile_thermostat/thermostat_climate.py b/custom_components/versatile_thermostat/thermostat_climate.py
index fb4cefa..24b6366 100644
--- a/custom_components/versatile_thermostat/thermostat_climate.py
+++ b/custom_components/versatile_thermostat/thermostat_climate.py
@@ -692,8 +692,9 @@ class ThermostatOverClimate(BaseThermostat[UnderlyingClimate]):
             else None
         )
 
+        last_sent_temperature = under.last_sent_temperature or 0
         under_temp_diff = (
-            (new_target_temp - under.last_sent_temperature) if new_target_temp else 0
+            (new_target_temp - last_sent_temperature) if new_target_temp else 0
         )
         if -1 < under_temp_diff < 1:
             under_temp_diff = 0