-$users->Limit( FIELD => $return, OPERATOR => '!=', VALUE => '' );
-$users->Limit( FIELD => $return, OPERATOR => 'IS NOT', VALUE => 'NULL', ENTRYAGGREGATOR => 'AND' );
+if ( RT->Config->Get('DatabaseType') eq 'Oracle' ) {
+ $users->Limit(
+ FIELD => $return,
+ OPERATOR => 'IS NOT',
+ VALUE => 'NULL',
+ );
+}
+else {
+ $users->Limit( FIELD => $return, OPERATOR => '!=', VALUE => '' );
+ $users->Limit(
+ FIELD => $return,
+ OPERATOR => 'IS NOT',
+ VALUE => 'NULL',
+ ENTRYAGGREGATOR => 'AND'
+ );
+}