From c2bf290fe071cfccb570fd81996bec53f28ee289 Mon Sep 17 00:00:00 2001
From: m-xim <170838360+m-xim@users.noreply.github.com>
Date: Mon, 27 May 2024 03:15:30 +0300
Subject: [PATCH] Update callback_data.py

Fixed an issue that prevented unpacking None values.
---
 aiogram/filters/callback_data.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/aiogram/filters/callback_data.py b/aiogram/filters/callback_data.py
index 50e9879a..96f2a64b 100644
--- a/aiogram/filters/callback_data.py
+++ b/aiogram/filters/callback_data.py
@@ -22,6 +22,7 @@ from uuid import UUID
 from magic_filter import MagicFilter
 from pydantic import BaseModel
 from pydantic.fields import FieldInfo
+from pydantic_core import PydanticUndefined
 
 from aiogram.filters.base import Filter
 from aiogram.types import CallbackQuery
@@ -131,7 +132,7 @@ class CallbackData(BaseModel):
         for k, v in zip(names, parts):  # type: str, Optional[str]
             if field := cls.model_fields.get(k):
                 if v == "" and _check_field_is_nullable(field):
-                    v = field.default
+                    v = field.default if field.default is not PydanticUndefined else None
             payload[k] = v
         return cls(**payload)