This simple test stub runs fine without the debugger:

#!/usr/bin/perl -w
use strict;
use XML::Parser::Lite;

my $p1 = new XML::Parser::Lite;

$p1->setHandlers(
    Start => sub { shift; print "start: @_\n" },
    Char => sub { shift; print "char: @_\n" },
    End => sub { shift; print "end: @_\n" },
  );

$p1->parse('<foo id="me">Hello World!</foo>');
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However, when stepped through the debugger (perl -d script.pl) it dies with the error:

not properly closed tag 'foo'
 at /usr/local/perl/XML/Parser/Lite.pm line 116
        XML::Parser::Lite::final() called at /usr/local/perl/XML/Parse
+r/Lite.pm line 105
        XML::Parser::Lite::parse('XML::Parser::Lite=HASH(0x848eda0)', 
+'<foo id="me">Hello World!</foo>') called at parse_tst.pl line 15
Debugged program terminated.  Use q to quit or R to restart,
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-Nitrox