ORA-01422: exact fetch returns more than requested number of rows when i trying to drop,how i can fi

SQL> drop table sys.t;

drop table sys.t

               *

ERROR at line 1:

ORA-01422: exact fetch returns more than requested number of rows

i have try

SQL> truncate table t;

Table truncated.

SQL> drop table t;

drop table t

           *

ERROR at line 1:

ORA-01422: exact fetch returns more than requested number of rows

what i can do now?