From b6316952c2705937bd9d587c29c3883e84a23db0 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sat, 9 Oct 2010 08:05:47 -0600
Subject: [PATCH] ...

---
 src/calibre/library/database2.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index 450ea77669..5bec43ab28 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -1254,7 +1254,7 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
         '''
         Set metadata for the book `id` from the `Metadata` object `mi`
         '''
-        if hasattr(mi, 'to_book_metadata'):
+        if callable(getattr(mi, 'to_book_metadata', None)):
             # Handle code passing in a OPF object instead of a Metadata object
             mi = mi.to_book_metadata()