diff --git a/homeassistant/core.py b/homeassistant/core.py
index 37baffa6f19..7a5d2b22862 100644
--- a/homeassistant/core.py
+++ b/homeassistant/core.py
@@ -2267,8 +2267,6 @@ class StateMachine:
             return
 
         if context is None:
-            if TYPE_CHECKING:
-                assert timestamp is not None
             context = Context(id=ulid_at_time(timestamp))
 
         if same_attr: