Foren / Cotonti / General / fatal sql error when selecting members in name/rank

I get this error:

Fatal error : SQL error : Unknown column 'user___' in 'order clause'

when I try to order members on name/group/etc.

I've found this error on the forums in combination with the news, but not with members. Got version (Revision) / Database 0.6.14(r1901) / 0.6.14

thx for the help