diff --git a/takway/clients/web_socket_client_utils.py b/takway/clients/web_socket_client_utils.py
index bcf722a..30b9cb3 100644
--- a/takway/clients/web_socket_client_utils.py
+++ b/takway/clients/web_socket_client_utils.py
@@ -482,6 +482,7 @@ class WebSocketClinet:
                     continue
             
             elif item[0] == 'audio_json':
+                data_type = item[0]['type']
                 print(f"data_type: {data_type}")
                 if self.wakeup_event.is_set():
                     if data_type == 'text':