Errors on mcp front if a pm is reported:

[phpBB Debug] PHP Notice: in file [ROOT]/includes/mcp/mcp_front.php on line 261: Undefined index: msg_id
[phpBB Debug] PHP Notice: in file [ROOT]/includes/mcp/mcp_front.php on line 262: Undefined index: msg_id
[phpBB Debug] PHP Notice: in file [ROOT]/includes/functions_privmsgs.php on line 2098: Undefined index: to_address
[phpBB Debug] PHP Notice: in file [ROOT]/includes/functions_privmsgs.php on line 2098: Undefined index: bcc_address
....

Due to the following line:
$sql_ary = $db->sql_build_query('SELECT', $sql_ary);
$result = $db->sql_query_limit($sql, 5);

Should be $sql instead of $sql_ary