ZFS zdb : wrong object path

Hello everybody,

When i run the command zdb on my freebsd, i have an "Object" that has the wrong path : path ???<object#26811>

Actually this object does not exist on my freebsd and I don't understand why it is still referenced by zfs in volumes (used and written).

More informations : http://pastebin.com/knUfy0xE

Can I delete this "Object" referenced by zfs ?
I run "zpool scrub zroot" but everythink is ok.

Thank's for help.