From afc602595b50a08a33b31566a736dd68d2ae9389 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Wed, 14 Oct 2020 04:06:51 -0500
Subject: [PATCH] Only validate entity id if it did not exist on state change
 (#41820)

---
 homeassistant/core.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/homeassistant/core.py b/homeassistant/core.py
index fa0e294e52e..795a67f3f19 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -1148,7 +1148,15 @@ class StateMachine:
         if context is None:
             context = Context()
 
-        state = State(entity_id, new_state, attributes, last_changed, None, context)
+        state = State(
+            entity_id,
+            new_state,
+            attributes,
+            last_changed,
+            None,
+            context,
+            old_state is None,
+        )
         self._states[entity_id] = state
         self._bus.async_fire(
             EVENT_STATE_CHANGED,