diff --git a/homeassistant/components/mqtt/subscription.py b/homeassistant/components/mqtt/subscription.py
index 29beafdbe84..7ccc31bd335 100644
--- a/homeassistant/components/mqtt/subscription.py
+++ b/homeassistant/components/mqtt/subscription.py
@@ -124,11 +124,9 @@ def async_prepare_subscribe_topics(
 
 async def async_subscribe_topics(
     hass: HomeAssistant,
-    sub_state: dict[str, EntitySubscription] | None,
+    sub_state: dict[str, EntitySubscription],
 ) -> None:
     """(Re)Subscribe to a set of MQTT topics."""
-    if sub_state is None:
-        return
     for sub in sub_state.values():
         await sub.subscribe()