db error while upgrade

[zodehala]

Database error in vBulletin 3.7.1:
Invalid SQL:
ALTER TABLE moderation CHANGE threadid primaryid INT UNSIGNED NULL DEFAULT '0';
MySQL Error   : Duplicate column name 'primaryid'
Error Number  : 1060
Request Date  : 
Error Date    : 
Script        : installyolu/upgrade_370b2.php?step=3
Referrer      : installyolu/upgrade_370b2.php?step=2
IP Address    : 
Username      : 
Classname     : vB_Database
MySQL Version : 5.0.45-community

[Steve Machol]

Which version are you upgrading from?

[zodehala]

3.6.8 -> 3.7.1

[Steve Machol]

That error indicates your database has already been upgrade to 3.7.1. Which version do you see when you log into the Admin CP?