From 3c16e95cee340f0166db9e2e256728dbf6dc6ac0 Mon Sep 17 00:00:00 2001
From: MichaelDvP <github@mdvp.de>
Date: Sun, 18 Aug 2024 16:47:14 +0200
Subject: [PATCH] fix read RC300WWtemp, #1950

---
 src/devices/thermostat.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/devices/thermostat.cpp b/src/devices/thermostat.cpp
index aefacd1c7..cb524acc0 100644
--- a/src/devices/thermostat.cpp
+++ b/src/devices/thermostat.cpp
@@ -1196,10 +1196,10 @@ void Thermostat::process_RC300WWtemp(std::shared_ptr<const Telegram> telegram) {
 void Thermostat::process_RC300WWmode(std::shared_ptr<const Telegram> telegram) {
     uint8_t circuit = 0;
     telegram->read_value(circuit, 0);
-    if (!circuit) {
+    auto dhw = dhw_circuit(telegram->type_id - 0x2F5, circuit, circuit != 0);
+    if (dhw == nullptr) {
         return;
     }
-    auto dhw = dhw_circuit(telegram->type_id - 0x2F5, circuit, true);
     // circulation pump see: https://github.com/Th3M3/buderus_ems-wiki/blob/master/Einstellungen%20der%20Bedieneinheit%20RC310.md
     has_update(telegram, dhw->wwCircPump_, 1); // FF=off, 0=on ?