diff --git a/locust/main.py b/locust/main.py
index f5819d2704..5c31483a7b 100644
--- a/locust/main.py
+++ b/locust/main.py
@@ -324,7 +324,8 @@ def stop_and_optionally_quit():
                 time.sleep(options.autoquit)
                 logger.info("--autoquit time reached, shutting down")
                 runner.quit()
-                web_ui.stop()
+                if web_ui:
+                    web_ui.stop()
             else:
                 logger.info("--autoquit not specified, leaving web ui running indefinitely")
         else:  # --headless run