if ($select->rows) {
   print(h1( {class=>'cyan'}, "Error occured $row->{username}! Script have to die" ));
   exit(0);
}

##</code><code>##

print(h1( {class=>'cyan'}, "Error occured $row->{username}! Script have to die" )), exit(0)
if $select->rows;

##</code><code>##

die(h1( {class=>'cyan'}, "Error occured $row->{username}! Script have to die" ));