diff --git a/pyrogram/raw/core/tl_object.py b/pyrogram/raw/core/tl_object.py
index b094f7d0..cd16aa0f 100644
--- a/pyrogram/raw/core/tl_object.py
+++ b/pyrogram/raw/core/tl_object.py
@@ -18,7 +18,7 @@
 
 from io import BytesIO
 from json import dumps
-from typing import cast, List, Any, Union, Dict
+from typing import cast, List, Any, Union, Dict, Optional
 
 from ..all import objects
 
@@ -29,8 +29,11 @@ class TLObject:
     QUALNAME = "Base"
 
     @classmethod
-    def read(cls, b: BytesIO, *args: Any) -> Any:
-        return cast(TLObject, objects[int.from_bytes(b.read(4), "little")]).read(b, *args)
+    def read(cls, b: BytesIO, *args: Any) -> Optional["TLObject"]:
+        function_name = objects.get(int.from_bytes(b.read(4), "little"))
+        if not function_name:
+            return None
+        return cast(TLObject, function_name).read(b, *args)
 
     def write(self, *args: Any) -> bytes:
         pass