diff --git a/sdk/python/feast/feature_server.py b/sdk/python/feast/feature_server.py
index 4f8de1eef5..9757e95143 100644
--- a/sdk/python/feast/feature_server.py
+++ b/sdk/python/feast/feature_server.py
@@ -90,9 +90,11 @@ def async_refresh():
         registry_proto = store.registry.proto()
         if shutting_down:
             return
-        nonlocal active_timer
-        active_timer = threading.Timer(registry_ttl_sec, async_refresh)
-        active_timer.start()
+
+        if registry_ttl_sec:
+            nonlocal active_timer
+            active_timer = threading.Timer(registry_ttl_sec, async_refresh)
+            active_timer.start()
 
     @asynccontextmanager
     async def lifespan(app: FastAPI):