odd error

All,

I am getting a strange error with the code below. Does anyone have an explanation?

thanks,
Michael

SQL> select unique market_cd, churn_dt
  2 from eisweb.eis_ret_cmbd_rpt
  3 where ( churn_dt = '01-jan-2004' or churn_dt = '31-dec-2004' )   4 -- and market_cd > chr(0)
  5 ;
from eisweb.eis_ret_cmbd_rpt

            *
ERROR at line 2:
ORA-00600: internal error code, arguments: [qksmmAdjustStatistics1], [], [], [], [], [], [], []

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