From 19d26597f8c6bf463ccea3ec806afa3f8775ade5 Mon Sep 17 00:00:00 2001
From: Cyril Margorin <cyril@imperx.com>
Date: Mon, 22 Nov 2021 17:04:35 +0300
Subject: [PATCH] Fix invalid 'FSMContextProxy.update()' function

---
 aiogram/dispatcher/storage.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/aiogram/dispatcher/storage.py b/aiogram/dispatcher/storage.py
index 340b6352..63ce25b2 100644
--- a/aiogram/dispatcher/storage.py
+++ b/aiogram/dispatcher/storage.py
@@ -408,6 +408,8 @@ class FSMContextProxy:
     def update(self, data=None, **kwargs):
         self._check_closed()
 
+        if data is None:
+            data = {}
         self._data.update(data, **kwargs)
 
     def pop(self, key, default=None):