error on uninstalling product

[gsmph]

can anybody help me about my problem.
i cant uninstall Browser on Who's Online 1.0.2 ==> This hack will show what browser the user is using on the Who's Online list.

once i try to uninstall this hack an error occur look below:

Database error in vBulletin 3.8.1:

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

MySQL Error   : Can't DROP 'browser'; check that column/key exists
Error Number  : 1091
Request Date  : Thursday, February 26th 2009 @ 06:30:09 AM
Error Date    : Thursday, February 26th 2009 @ 06:30:09 AM
Script        : http://xxxxxxxxxxxxx/vb/admincp/plugin.php?do=productkill
Referrer      : http://xxxxxxxxxxxxx/vb/admincp/plugin.php?do=productdelete&productid=browser_on_wol&s=

please help me

[Lynne]

Questions regarding modifications should be asked in the modification thread (wherever you got the modification).

[gsmph]

@Lynne
its not a modification after upgrading from 364 to 381 i encounter this problem i cant UNINSTALL that product means i want to remove it not modify it. thats why here i post..

br
gsmph

[Removed-836727]

it seems that you tried to uninstall it and it stopped and now it can't work because the browser column has been removed with the first uninstall-try

check it with phpmyadmin
if its realy away, just remove the "alter part" from your deinstallcode