unromovable plug-in

[zodehala]

i have installed plug-in is called "Browser on Who's Online" (i found it from here)

while i am uninstalling it following error is occured and the proccess is failed

how can i uninstall it ???????????????

Database error in vBulletin 3.5.3:

Invalid SQL:
ALTER TABLE `session` DROP `browser`;;

MySQL Error  : Can't DROP 'browser'; check that column/key exists
Error Number : 1091
Date         : Sunday, January 15th 2006 @ 06:19:10 AM
Script       : http://www.xforum.com/admincp/plugin.php
Referrer     : http://www.xforum.com/admincp/plugin.php?do=productdelete&productid=browser_on_wol&s=
Classname    : vb_database