diff --git a/homeassistant/components/squeezebox/config_flow.py b/homeassistant/components/squeezebox/config_flow.py
index 9ccac13223b..95af3e8032a 100644
--- a/homeassistant/components/squeezebox/config_flow.py
+++ b/homeassistant/components/squeezebox/config_flow.py
@@ -3,7 +3,7 @@
 import asyncio
 from http import HTTPStatus
 import logging
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 from pysqueezebox import Server, async_discover
 import voluptuous as vol
@@ -102,7 +102,7 @@ class SqueezeboxConfigFlow(ConfigFlow, domain=DOMAIN):
         # update with suggested values from discovery
         self.data_schema = _base_schema(self.discovery_info)
 
-    async def _validate_input(self, data):
+    async def _validate_input(self, data: dict[str, Any]) -> str | None:
         """Validate the user input allows us to connect.
 
         Retrieve unique id and abort if already configured.
@@ -129,6 +129,8 @@ class SqueezeboxConfigFlow(ConfigFlow, domain=DOMAIN):
             await self.async_set_unique_id(status["uuid"])
             self._abort_if_unique_id_configured()
 
+        return None
+
     async def async_step_user(self, user_input=None):
         """Handle a flow initialized by the user."""
         errors = {}
diff --git a/homeassistant/components/squeezebox/media_player.py b/homeassistant/components/squeezebox/media_player.py
index aaf64c34ddf..552b8ed800c 100644
--- a/homeassistant/components/squeezebox/media_player.py
+++ b/homeassistant/components/squeezebox/media_player.py
@@ -281,10 +281,11 @@ class SqueezeBoxEntity(MediaPlayerEntity):
         self.hass.data[DOMAIN][KNOWN_PLAYERS].remove(self)
 
     @property
-    def volume_level(self):
+    def volume_level(self) -> float | None:
         """Volume level of the media player (0..1)."""
         if self._player.volume:
             return int(float(self._player.volume)) / 100.0
+        return None
 
     @property
     def is_volume_muted(self):