diff --git a/homeassistant/components/roomba/entity.py b/homeassistant/components/roomba/entity.py
index aaa2c8963736..3f4559f2188e 100644
--- a/homeassistant/components/roomba/entity.py
+++ b/homeassistant/components/roomba/entity.py
@@ -29,7 +29,11 @@ class IRobotEntity(Entity):
             model=self.vacuum_state.get("sku"),
             name=str(self.vacuum_state.get("name")),
             sw_version=self.vacuum_state.get("softwareVer"),
-            hw_version=self.vacuum_state.get("hardwareRev"),
+            hw_version=(
+                str(hw_rev)
+                if (hw_rev := self.vacuum_state.get("hardwareRev")) is not None
+                else None
+            ),
         )
 
         if mac_address := self.vacuum_state.get("hwPartsRev", {}).get(