diff --git a/pyrogram/storage/memory_storage.py b/pyrogram/storage/memory_storage.py
index 12783bb5..49343540 100644
--- a/pyrogram/storage/memory_storage.py
+++ b/pyrogram/storage/memory_storage.py
@@ -50,4 +50,4 @@ class MemoryStorage(SQLiteStorage):
             await self.date(0)
 
     async def delete(self):
-        raise NotImplementedError
+        pass