From fe00145d1c136358a87fe47d13462d997015ed86 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Tue, 6 Mar 2018 15:13:13 +0200
Subject: [PATCH] Fix bridging documents without thumbnails

---
 mautrix_telegram/portal.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mautrix_telegram/portal.py b/mautrix_telegram/portal.py
index bbd13273..25e642e1 100644
--- a/mautrix_telegram/portal.py
+++ b/mautrix_telegram/portal.py
@@ -870,7 +870,7 @@ class Portal:
             "size": document.size,
             "mimetype": mime_type,
         }
-        if document.thumb:
+        if document.thumb and not isinstance(document.thumb, PhotoSizeEmpty):
             thumbnail = await util.transfer_file_to_matrix(self.db, source.client, intent,
                                                            document.thumb.location)
             info["thumbnail_info"] = {