function timezone_identifiers_list used before checked for existance. Lead to Fatal error

Fatal error: Call to undefined function timezone_identifiers_list() in /mnt/105/sdb/a/b/(...)/mantisbt-1.2.19/admin/check.php on line 388

Solution:
move line
$t_timezone_valid = in_array( $t_timezone, timezone_identifiers_list() );
from line 388 to after line 390
(inside next "if" block:)

/////////////////////////////// Current code //////////////////////////////
387:if( $t_timezone_set ) {
$t_timezone_valid = in_array( $t_timezone, timezone_identifiers_list() );
$t_msg = "Checking if the specified timezone is valid";
if( function_exists( 'timezone_identifiers_list' ) ) {

    if( !$t_timezone_valid ) {

/////////////////////////////// Should be: //////////////////////////////
387:if( $t_timezone_set ) {

$t_msg = "Checking if the specified timezone is valid";
if( function_exists( 'timezone_identifiers_list' ) ) {
    $t_timezone_valid = in_array( $t_timezone, timezone_identifiers_list() );
    if( !$t_timezone_valid ) {