From d8bf47c1018984e7959437aa9228cb5b8d1e8a56 Mon Sep 17 00:00:00 2001
From: Joost Lekkerkerker <joostlek@outlook.com>
Date: Thu, 27 Feb 2025 22:50:34 +0100
Subject: [PATCH] Only lowercase SmartThings media input source if we have it
 (#139468)

---
 homeassistant/components/smartthings/sensor.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/homeassistant/components/smartthings/sensor.py b/homeassistant/components/smartthings/sensor.py
index bc986894045..2d817c182da 100644
--- a/homeassistant/components/smartthings/sensor.py
+++ b/homeassistant/components/smartthings/sensor.py
@@ -461,7 +461,7 @@ CAPABILITY_TO_SENSORS: dict[
                 translation_key="media_input_source",
                 device_class=SensorDeviceClass.ENUM,
                 options_attribute=Attribute.SUPPORTED_INPUT_SOURCES,
-                value_fn=lambda value: value.lower(),
+                value_fn=lambda value: value.lower() if value else None,
             )
         ]
     },