diff --git a/meta_ui.py b/meta_ui.py
index 2405165..23a7a75 100644
--- a/meta_ui.py
+++ b/meta_ui.py
@@ -105,6 +105,9 @@ def chat(
 ):
     from queue import Queue, Empty
 
+    # 解析传入的 ChatInput 格式
+    user = user_msg["text"] if isinstance(user_msg, dict) and "text" in user_msg else user_msg
+    
     # 构造 OpenAI 风格 messages，仅用于 /v1/chat/completions
     if api_suffix == "/v1/chat/completions":
         messages = []
@@ -118,9 +121,6 @@ def chat(
     else:
         prompt_input = user  # 原来的单轮文本 prompt
 
-    # 解析传入的 ChatInput 格式
-    user = user_msg["text"] if isinstance(user_msg, dict) and "text" in user_msg else user_msg
-
     stop = [s.strip() for s in stop_raw.split(",") if s.strip()] or None
     samp = {
         ("max_tokens" if api_suffix == "/v1/completions" else "max_new_tokens"): int(max_new),