diff --git a/funasr/bin/vad_inference_launch.py b/funasr/bin/vad_inference_launch.py
index 1f17c5bee..0878c9d58 100644
--- a/funasr/bin/vad_inference_launch.py
+++ b/funasr/bin/vad_inference_launch.py
@@ -239,9 +239,13 @@ def inference_vad_online(
             ibest_writer = None
 
         vad_results = []
-        batch_in_cache = param_dict['in_cache'] if param_dict is not None else dict()
-        is_final = param_dict.get('is_final', False) if param_dict is not None else False
-        max_end_sil = param_dict.get('max_end_sil', 800) if param_dict is not None else 800
+        if param_dict is None:
+                param_dict = dict()
+                param_dict['in_cache'] = dict()
+                param_dict['is_final'] = True
+        batch_in_cache = param_dict.get('in_cache', dict())
+        is_final = param_dict.get('is_final', False)
+        max_end_sil = param_dict.get('max_end_sil', 800)
         for keys, batch in loader:
             assert isinstance(batch, dict), type(batch)
             assert all(isinstance(s, str) for s in keys), keys