diff --git a/ptvp35/__init__.py b/ptvp35/__init__.py
index 364b6e2..eccacbe 100644
--- a/ptvp35/__init__.py
+++ b/ptvp35/__init__.py
@@ -286,6 +286,8 @@ class DbConnection:
             self.__task.cancel()
         await self._dump_buffer()
         self.__file.close()
+        self.__pool.shutdown()
+        self.__pool = concurrent.futures.ThreadPoolExecutor()
         await self._build_file(self.__mmdb)
         self.not_running = True
         self.__pool.shutdown()