ORA-24812: character set conversion to or from UCS2 failed

[Ganer]

ORA-24812: character set conversion to or from UCS2 failed

$select = $row["ATACHMENT"];
$x = $select->load();

из большого цлоба читаю и получаю
ORA-24812: character set conversion to or from UCS2 failed


цлобы поменьше вроде нормально ...
есть предложения кроме супорта ?

$ORACLE_HOME/bin/oerr ORA 24812
24812, 00000, "character set conversion to or from UCS2 failed"
// *Cause: If the database character set is varying-width, the CLOB/NCLOB
// value is implicitly converted to or from UCS2. This implicit
// conversion failed.
// *Action: Contact Oracle Worldwide Support.