Bukkit

What steps will reproduce the problem?
1. Use a phpbb-board
2. Add a new custom-profile-field
3. try to use that field as your minecraft-name
4. Profit: Exception
modes:
  normal:
    user-table: phpbb_users
    minecraft-login-name-field: pf_mc_username
    rank-id-field: user_rank
    multitable:
      enable-multiple-tables: 'true'
      second-table: phpbb_profile_fields_data
      user-id-field-in-user-table: user_id
      user-id-field-in-second-table: user_id

What is the expected output? What do you see instead?
It should work, but it throws this exeption:
2012-01-16 14:57:05 [WARNING] [OKB3] [MySQL] Error in SQL query: Unknown column 'pf_mc_username' in 'where clause'
2012-01-16 14:57:05 [SEVERE] java.sql.SQLException: Operation not allowed after ResultSet closed
2012-01-16 14:57:05 [SEVERE]     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)
2012-01-16 14:57:05 [SEVERE]     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
2012-01-16 14:57:05 [SEVERE]     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
2012-01-16 14:57:05 [SEVERE]     at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
2012-01-16 14:57:05 [SEVERE]     at com.mysql.jdbc.ResultSetImpl.checkClosed(ResultSetImpl.java:794)
2012-01-16 14:57:05 [SEVERE]     at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:7145)
2012-01-16 14:57:05 [SEVERE]     at me.kalmanolah.okb3.OKFunctions.GetMySQLPosts(OKFunctions.java:453)
2012-01-16 14:57:05 [SEVERE]     at me.kalmanolah.okb3.OKFunctions.updatePosts(OKFunctions.java:468)
2012-01-16 14:57:05 [SEVERE]     at me.kalmanolah.okb3.OKRunnable.run(OKRunnable.java:127)
2012-01-16 14:57:05 [SEVERE]     at java.lang.Thread.run(Unknown Source)

What version of the product are you using?
the newest: v3.4.0

Do you have an error log of what happened?
sure, see above

Please provide any additional information below.

This only fails when rank-change is enabled!