diff --git a/greendeck/lib/homeassistant/__init__.py b/greendeck/lib/homeassistant/__init__.py
index f09511f..c1ad2fa 100644
--- a/greendeck/lib/homeassistant/__init__.py
+++ b/greendeck/lib/homeassistant/__init__.py
@@ -100,7 +100,7 @@ class EventState(BaseModel):
 
 class EventData(BaseModel):
     entity_id: str
-    new_state: EventState
+    new_state: EventState | None
     old_state: EventState | None