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In includes\db\DatabasePostgres.php file line 1235.

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$ctype = pg_fetch_result($this->doQuery("SHOW lc_ctype"),0,0);

$SQL = "UPDATE mediawiki_version SET mw_version=$mwv, "
        ."pg_version=$pgv, pg_user=$pgu, "
        ."mw_schema = $mws, ts2_schema = $tss, "
        ."pg_port=$pgp, pg_dbname=$dbn, "
	."ctype = '$ctype' "
	."WHERE type = 'Creation'";
$this->query($SQL);

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When the command "SHOW lc_ctype" returns a string include "'" symbol, 
for example: "Chinese_People's Republic of China.936", the sql failed, because the "'" symbol was not escaped.