From aeeb94d38635f0e6b22cfa2acc6afbd84a00b914 Mon Sep 17 00:00:00 2001
From: eternnoir <eternnoir@gmail.com>
Date: Wed, 15 Jul 2015 11:02:30 +0800
Subject: [PATCH] Fix api's document change.

---
 telebot/types.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/telebot/types.py b/telebot/types.py
index ea7923f..5bf3eb9 100644
--- a/telebot/types.py
+++ b/telebot/types.py
@@ -228,8 +228,9 @@ class Document(JsonDeserializable):
         obj = cls.check_json(json_string)
         file_id = obj['file_id']
         thumb = None
-        if 'file_id' in obj['thumb']:
-            thumb = PhotoSize.de_json(obj['thumb'])
+        if 'thumb' in obj:
+            if 'file_id' in obj['thumb']:
+                thumb = PhotoSize.de_json(obj['thumb'])
         file_name = None
         mime_type = None
         file_size = None