diff --git a/homeassistant/components/bang_olufsen/util.py b/homeassistant/components/bang_olufsen/util.py
index 617eb4b1df6..c54b3059ee4 100644
--- a/homeassistant/components/bang_olufsen/util.py
+++ b/homeassistant/components/bang_olufsen/util.py
@@ -9,11 +9,8 @@ from homeassistant.helpers.device_registry import DeviceEntry
 from .const import DOMAIN
 
 
-def get_device(hass: HomeAssistant | None, unique_id: str) -> DeviceEntry | None:
+def get_device(hass: HomeAssistant, unique_id: str) -> DeviceEntry:
     """Get the device."""
-    if not isinstance(hass, HomeAssistant):
-        return None
-
     device_registry = dr.async_get(hass)
     device = device_registry.async_get_device({(DOMAIN, unique_id)})
     assert device
diff --git a/homeassistant/components/bang_olufsen/websocket.py b/homeassistant/components/bang_olufsen/websocket.py
index dc505ddf3c4..0c0a5096d91 100644
--- a/homeassistant/components/bang_olufsen/websocket.py
+++ b/homeassistant/components/bang_olufsen/websocket.py
@@ -157,11 +157,6 @@ class BangOlufsenWebsocket(BangOlufsenBase):
         software_status = await self._client.get_softwareupdate_status()
 
         # Update the HA device if the sw version does not match
-        if not self._device:
-            self._device = get_device(self.hass, self._unique_id)
-
-        assert self._device
-
         if software_status.software_version != self._device.sw_version:
             device_registry = dr.async_get(self.hass)
 
@@ -172,10 +167,6 @@ class BangOlufsenWebsocket(BangOlufsenBase):
 
     def on_all_notifications_raw(self, notification: dict) -> None:
         """Receive all notifications."""
-        if not self._device:
-            self._device = get_device(self.hass, self._unique_id)
-
-        assert self._device
 
         # Add the device_id and serial_number to the notification
         notification["device_id"] = self._device.id