-$result = SQL_QUERY("SELECT id FROM "._MYSQL_PREFIX."_refsystem WHERE level=0", __FILE__, __LINE__);
-if (SQL_NUMROWS($result) > 0) {
+$result = SQL_QUERY('SELECT `id` FROM `{?_MYSQL_PREFIX?}_refsystem` WHERE `level`=0', __FILE__, __LINE__);
+if (!SQL_HASZERONUMS($result)) {
+ // Remove index temporaly
+ SQL_ALTER_TABLE('ALTER TABLE `{?_MYSQL_PREFIX?}_refsystem` DROP INDEX `userid_level`', __FILE__, __LINE__);
+