xthreads upgrade

[1master1]

trying to upgrade from 1.32 to 1.337 gave an database change error

Code:

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Site has experienced an internal SQL error and cannot continue. SQL Error: 1060 - Duplicate column name 'tabstop' Query: ALTER TABLE `nstdb_threadfields` ADD COLUMN ( `tabstop` tinyint(1) not null default 1 )

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had 2 custom xthread fields and the tabstop is not null for both. tabstop(1)

need help in upgrading