diff --git a/api/apps/dialog_app.py b/api/apps/dialog_app.py
index 32f5cdbc8..33502f402 100644
--- a/api/apps/dialog_app.py
+++ b/api/apps/dialog_app.py
@@ -44,6 +44,7 @@ async def set_dialog():
 
     name = name.strip()
     if is_create:
+        # only for chat creating
         existing_names = {
             d.name.casefold()
             for d in DialogService.query(tenant_id=current_user.id, status=StatusEnum.VALID.value)
@@ -68,8 +69,10 @@ async def set_dialog():
     meta_data_filter = req.get("meta_data_filter", {})
     prompt_config = req["prompt_config"]
 
-    if not req.get("kb_ids", []) and not prompt_config.get("tavily_api_key") and "{knowledge}" in prompt_config.get("system", ""):
-        return get_data_error_result(message="Please remove `{knowledge}` in system prompt since no dataset / Tavily used here.")
+    if not is_create:
+        # only for chat updating
+        if not req.get("kb_ids", []) and not prompt_config.get("tavily_api_key") and "{knowledge}" in prompt_config.get("system", ""):
+            return get_data_error_result(message="Please remove `{knowledge}` in system prompt since no dataset / Tavily used here.")
 
     for p in prompt_config.get("parameters", []):
         if p["optional"]: