diff --git a/llmengine/base_chat_llm.py b/llmengine/base_chat_llm.py
index ee62d86..958ded9 100644
--- a/llmengine/base_chat_llm.py
+++ b/llmengine/base_chat_llm.py
@@ -107,14 +107,15 @@ class BaseChatLLM:
 		inputs = self._messages2inputs(messages)
 		input_len = inputs["input_ids"].shape[-1]
 		streamer = self.get_streamer()
-		kwargs = self.build_kwargs(inputs, streamer)
-		thread = threading.Thread(target=self.model.generate, 
-						kwargs=kwargs)
-		thread.start()
-		for d in self.output_generator(streamer):
-			if d['choices'][0]['finish_reason'] == 'stop':
-				d['input_tokens'] = input_len
-			yield d
+		with self.get_streamer() as streamer:
+			kwargs = self.build_kwargs(inputs, streamer)
+			thread = threading.Thread(target=self.model.generate, 
+							kwargs=kwargs)
+			thread.start()
+			for d in self.output_generator(streamer):
+				if d['choices'][0]['finish_reason'] == 'stop':
+					d['input_tokens'] = input_len
+				yield d
 
 	async def async_gen(self, messages):
 		async for d in stream.iterate(self._gen(messages)):