From 108aed7843cab560b28e9140cd3b9a0b52177f84 Mon Sep 17 00:00:00 2001
From: Michael <35783820+mib1185@users.noreply.github.com>
Date: Sun, 5 Nov 2023 12:41:15 +0100
Subject: [PATCH] Fix serial in Flo device information (#103427)

---
 homeassistant/components/flo/device.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/homeassistant/components/flo/device.py b/homeassistant/components/flo/device.py
index 99e86d4b6b5..bcc52f512a1 100644
--- a/homeassistant/components/flo/device.py
+++ b/homeassistant/components/flo/device.py
@@ -139,9 +139,9 @@ class FloDeviceDataUpdateCoordinator(DataUpdateCoordinator):
         return self._device_information["fwVersion"]
 
     @property
-    def serial_number(self) -> str:
+    def serial_number(self) -> str | None:
         """Return the serial number for the device."""
-        return self._device_information["serialNumber"]
+        return self._device_information.get("serialNumber")
 
     @property
     def pending_info_alerts_count(self) -> int: