mercurial/commands.py

--- a/mercurial/commands.py	Thu Nov 29 08:44:54 2012 -0500
+++ b/mercurial/commands.py	Mon Dec 24 13:26:13 2012 +0100
@@ -4288,7 +4288,7 @@
 
     if not node and repo._bookmarkcurrent:
         bmheads = repo.bookmarkheads(repo._bookmarkcurrent)
-        curhead = repo[repo._bookmarkcurrent]
+        curhead = repo[repo._bookmarkcurrent].node()
         if len(bmheads) == 2:
             if curhead == bmheads[0]:
                 node = bmheads[1]