use strict;
use XML::Twig;

warn XML::Twig->VERSION;

my $twig = XML::Twig->new();
$twig->parse(<<'XML');
    <addr>
      <city/>
    </addr>
XML

my $res = eval {
  $twig->first_child('address')->first_child('city')->text;
};
print "Got " . $res;
__END__
3.48 at tmp.pl line 4.
Use of uninitialized value $res in concatenation (.) or string at tmp.pl line 16.
Got