diff --git a/lmdeploy/serve/gradio/app.py b/lmdeploy/serve/gradio/app.py
index a3cd00351e..7812358eff 100644
--- a/lmdeploy/serve/gradio/app.py
+++ b/lmdeploy/serve/gradio/app.py
@@ -48,7 +48,6 @@ def run(model_path_or_server: str,
         pipeline_type, _ = get_task(model_path_or_server)
         if pipeline_type == 'vlm':
             from lmdeploy.serve.gradio.vl import run_local
-            assert backend == 'turbomind', 'vlm only support turbomind backend'
             if backend_config is not None and \
                     backend_config.session_len is None:
                 backend_config.session_len = 8192
diff --git a/lmdeploy/serve/gradio/vl.py b/lmdeploy/serve/gradio/vl.py
index 64bf8c6160..ebeb371492 100644
--- a/lmdeploy/serve/gradio/vl.py
+++ b/lmdeploy/serve/gradio/vl.py
@@ -174,7 +174,10 @@ def cancel(chatbot, session):
 
     def reset(session):
         """Reset a new session."""
-        stop(session)
+        if session is None:
+            session = Session()
+        else:
+            stop(session)
         session._step = 0
         session._message = []
         return [], session, enable_btn