diff --git a/pytchat/core_async/livechat.py b/pytchat/core_async/livechat.py
index 715064e..2cc3ff8 100644
--- a/pytchat/core_async/livechat.py
+++ b/pytchat/core_async/livechat.py
@@ -325,7 +325,8 @@ class LiveChatAsync:
             self._pauser.put_nowait(None)
         self._is_alive = False
         self._buffer.put_nowait({})
-
+        self.processor.finalize()
+        
     def _task_finished(self):
         '''
         Listenerを終了する。
diff --git a/pytchat/core_multithread/livechat.py b/pytchat/core_multithread/livechat.py
index e06bc8a..7f99c55 100644
--- a/pytchat/core_multithread/livechat.py
+++ b/pytchat/core_multithread/livechat.py
@@ -316,6 +316,7 @@ class LiveChat:
         self._is_alive = False
         self._buffer.put({})
         self._event.set()
+        self.processor.finalize()
 
     def _task_finished(self):
         '''
diff --git a/pytchat/processors/chat_processor.py b/pytchat/processors/chat_processor.py
index 98d2227..3af82e7 100644
--- a/pytchat/processors/chat_processor.py
+++ b/pytchat/processors/chat_processor.py
@@ -21,3 +21,10 @@ class ChatProcessor:
             }
         '''
         pass
+
+    def finalize(self, *args, **kwargs):
+        '''
+        Interface for finalizing the process.
+        Called when chat fetching finished.
+        '''
+        pass