From b23ba9dbdb31865dcddf43fb78cd9423ac64ea5a Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 16 Mar 2019 13:58:54 +0530
Subject: [PATCH] ...

---
 src/calibre/gui2/update.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calibre/gui2/update.py b/src/calibre/gui2/update.py
index 86da8c1be6..3e878ba97a 100644
--- a/src/calibre/gui2/update.py
+++ b/src/calibre/gui2/update.py
@@ -103,6 +103,8 @@ class CheckForUpdates(Thread):
 
 
 def version_key(calibre_version):
+    if isinstance(calibre_version, bytes):
+        calibre_version = calibre_version.decode('utf-8')
     if calibre_version.count('.') > 1:
         calibre_version = calibre_version.rpartition('.')[0]
     return calibre_version