diff --git a/pyrogram/crypto/mtproto.py b/pyrogram/crypto/mtproto.py
index e147c22a..6d1521a4 100644
--- a/pyrogram/crypto/mtproto.py
+++ b/pyrogram/crypto/mtproto.py
@@ -16,18 +16,13 @@
 #  You should have received a copy of the GNU Lesser General Public License
 #  along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
 
-import bisect
 from hashlib import sha256
 from io import BytesIO
 from os import urandom
-from typing import List
 
 from pyrogram.errors import SecurityCheckMismatch
 from pyrogram.raw.core import Message, Long
 from . import aes
-from ..session.internals import MsgId
-
-STORED_MSG_IDS_MAX_SIZE = 1000 * 2
 
 
 def kdf(auth_key: bytes, msg_key: bytes, outgoing: bool) -> tuple:
@@ -59,8 +54,7 @@ def unpack(
     b: BytesIO,
     session_id: bytes,
     auth_key: bytes,
-    auth_key_id: bytes,
-    stored_msg_ids: List[int]
+    auth_key_id: bytes
 ) -> Message:
     SecurityCheckMismatch.check(b.read(8) == auth_key_id, "b.read(8) == auth_key_id")
 
@@ -103,26 +97,4 @@ def unpack(
     # https://core.telegram.org/mtproto/security_guidelines#checking-msg-id
     SecurityCheckMismatch.check(message.msg_id % 2 != 0, "message.msg_id % 2 != 0")
 
-    if len(stored_msg_ids) > STORED_MSG_IDS_MAX_SIZE:
-        del stored_msg_ids[:STORED_MSG_IDS_MAX_SIZE // 2]
-
-    if stored_msg_ids:
-        if message.msg_id < stored_msg_ids[0]:
-            raise SecurityCheckMismatch("The msg_id is lower than all the stored values")
-
-        if message.msg_id in stored_msg_ids:
-            raise SecurityCheckMismatch("The msg_id is equal to any of the stored values")
-
-        time_diff = (message.msg_id - MsgId()) / 2 ** 32
-
-        if time_diff > 30:
-            raise SecurityCheckMismatch("The msg_id belongs to over 30 seconds in the future. "
-                                        "Most likely the client time has to be synchronized.")
-
-        if time_diff < -300:
-            raise SecurityCheckMismatch("The msg_id belongs to over 300 seconds in the past. "
-                                        "Most likely the client time has to be synchronized.")
-
-    bisect.insort(stored_msg_ids, message.msg_id)
-
     return message
diff --git a/pyrogram/session/session.py b/pyrogram/session/session.py
index 3ce96a8f..54814906 100644
--- a/pyrogram/session/session.py
+++ b/pyrogram/session/session.py
@@ -17,6 +17,7 @@
 #  along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
 
 import asyncio
+import bisect
 import logging
 import os
 from hashlib import sha1
@@ -32,7 +33,7 @@ from pyrogram.errors import (
 )
 from pyrogram.raw.all import layer
 from pyrogram.raw.core import TLObject, MsgContainer, Int, FutureSalts
-from .internals import MsgFactory
+from .internals import MsgId, MsgFactory
 
 log = logging.getLogger(__name__)
 
@@ -50,6 +51,7 @@ class Session:
     MAX_RETRIES = 10
     ACKS_THRESHOLD = 10
     PING_INTERVAL = 5
+    STORED_MSG_IDS_MAX_SIZE = 1000 * 2
 
     def __init__(
         self,
@@ -176,20 +178,14 @@ class Session:
         await self.start()
 
     async def handle_packet(self, packet):
-        try:
-            data = await self.loop.run_in_executor(
-                pyrogram.crypto_executor,
-                mtproto.unpack,
-                BytesIO(packet),
-                self.session_id,
-                self.auth_key,
-                self.auth_key_id,
-                self.stored_msg_ids
-            )
-        except SecurityCheckMismatch as e:
-            log.warning("Discarding packet: %s", e)
-            await self.connection.close()
-            return
+        data = await self.loop.run_in_executor(
+            pyrogram.crypto_executor,
+            mtproto.unpack,
+            BytesIO(packet),
+            self.session_id,
+            self.auth_key,
+            self.auth_key_id
+        )
 
         messages = (
             data.body.messages
@@ -206,6 +202,33 @@ class Session:
                 else:
                     self.pending_acks.add(msg.msg_id)
 
+            try:
+                if len(self.stored_msg_ids) > Session.STORED_MSG_IDS_MAX_SIZE:
+                    del self.stored_msg_ids[:Session.STORED_MSG_IDS_MAX_SIZE // 2]
+
+                if self.stored_msg_ids:
+                    if msg.msg_id < self.stored_msg_ids[0]:
+                        raise SecurityCheckMismatch("The msg_id is lower than all the stored values")
+
+                    if msg.msg_id in self.stored_msg_ids:
+                        raise SecurityCheckMismatch("The msg_id is equal to any of the stored values")
+
+                    time_diff = (msg.msg_id - MsgId()) / 2 ** 32
+
+                    if time_diff > 30:
+                        raise SecurityCheckMismatch("The msg_id belongs to over 30 seconds in the future. "
+                                                    "Most likely the client time has to be synchronized.")
+
+                    if time_diff < -300:
+                        raise SecurityCheckMismatch("The msg_id belongs to over 300 seconds in the past. "
+                                                    "Most likely the client time has to be synchronized.")
+            except SecurityCheckMismatch as e:
+                log.warning("Discarding packet: %s", e)
+                await self.connection.close()
+                return
+            else:
+                bisect.insort(self.stored_msg_ids, msg.msg_id)
+
             if isinstance(msg.body, (raw.types.MsgDetailedInfo, raw.types.MsgNewDetailedInfo)):
                 self.pending_acks.add(msg.body.answer_msg_id)
                 continue
@@ -323,7 +346,7 @@ class Session:
                 RPCError.raise_it(result, type(data))
 
             if isinstance(result, raw.types.BadMsgNotification):
-                raise BadMsgNotification(result.error_code)
+                log.warning("%s: %s", BadMsgNotification.__name__, BadMsgNotification(result.error_code))
 
             if isinstance(result, raw.types.BadServerSalt):
                 self.salt = result.new_server_salt