From 42f15ef906bcc2bc64baf61246895f7300f398da Mon Sep 17 00:00:00 2001
From: Alex Root Junior <jroot.junior@gmail.com>
Date: Fri, 4 Aug 2017 12:00:49 +0300
Subject: [PATCH] Fix date parser.

---
 aiogram/types/chat_member.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/aiogram/types/chat_member.py b/aiogram/types/chat_member.py
index 01bbcccb..e471a91d 100644
--- a/aiogram/types/chat_member.py
+++ b/aiogram/types/chat_member.py
@@ -37,7 +37,8 @@ class ChatMember(Deserializable):
 
     @classmethod
     def _parse_date(cls, unix_time):
-        return datetime.datetime.fromtimestamp(unix_time)
+        if unix_time is not None:
+            return datetime.datetime.fromtimestamp(unix_time)
 
     @classmethod
     def de_json(cls, raw_data):