If the autostart file is not present, seahorse-daemon crashes on startup:

** (seahorse-daemon:29213): WARNING **: Could not load desktop file '/usr/local/etc/xdg/autostart/seahorse-daemon.desktop': No such file or directory

Program received signal SIGSEGV, Segmentation fault.
0x000000000048591a in egg_set_desktop_file (
    desktop_file_path=0x485da0 "/usr/local/etc/xdg/autostart/seahorse-daemon.desktop")
    at eggdesktopfile.c:1444
1444	  if (egg_desktop_file->name)
(gdb) bt

+ Trace 220246

1439			 desktop_file_path, error->message);
1440	      g_error_free (error);
1441	    }
1442	
1443	  /* Set localized application name and default window icon */
1444	  if (egg_desktop_file->name)
1445	    g_set_application_name (egg_desktop_file->name);
1446	  if (egg_desktop_file->icon)
1447	    {
1448	      if (g_path_is_absolute (egg_desktop_file->icon))
(gdb) p egg_desktop_file
$1 = (EggDesktopFile *) 0x0

The problem is that egg_desktop_file_new() returns NULL, but doesn't set error. I. e. g_key_file_load_from_file() does not set error properly.

Context: seahorse-daemon should not have an autostart .desktop file, since it costs quite a lot of startup time and is not even needed for the ssh and GPG agents; only for the nautilus plugin and the key manager application. I'll file a separate bug for this, though.