From e2c00b9a7ac58c5904f02a7f2575e3b89780059d Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 14 Sep 2009 13:34:48 -0600
Subject: [PATCH] Fix #3486 (Edit metadata crash)

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

diff --git a/src/calibre/gui2/dialogs/metadata_single.py b/src/calibre/gui2/dialogs/metadata_single.py
index 346bf97336..de8fc516ef 100644
--- a/src/calibre/gui2/dialogs/metadata_single.py
+++ b/src/calibre/gui2/dialogs/metadata_single.py
@@ -330,6 +330,8 @@ class MetadataSingleDialog(ResizableDialog, Ui_MetadataSingleDialog):
                 if not ext:
                     ext = ''
                 size = self.db.sizeof_format(row, ext)
+                if size is None:
+                    continue
                 Format(self.formats, ext, size)