cant upgrade from 9.8 to 9.8.1

[popf]

Upgrade:
This will upgrade the database for Pligg Beta v9.0 and above to the latest version.

Note: this is just a database upgrade, you still need to upload the new files.
Upgrading Tables...

Regenerating the totals table...

If you see a "Duplicate key name `link_search`" warning, just ignore it.
Warning: Duplicate key name 'link_search' in F:\xxx\www.ipopf.info\libs\db.php on line 233
Clearing templates_c directory...

If there were no errors displayed, upgrade is complete!

[AshDigg]

"If you see a "Duplicate key name `link_search`" warning, just ignore it."

Either just ignore it or use this upgrade.php file.