I installed Text::SpellChecker. Your code runs for me without errors on perl version 5.8.9, but I get your error on version 5.12.2.

I copied the relevant code from SpellChecker.pm and placed a comment on line 263: 

sub next_word {
    my $self = shift;
    pos $self->{text} = $self->{position};
    my $word;
    my $sp = $self->_hunspell || $self->_aspell;
    while ($self->{text} =~ m/([a-zA-Z]+(?:'[a-zA-Z]+)?)/g) {
        $word = $1;
        next if $self->{ignore_list}{$word};
        last if !$sp->check($word);  # 263

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There were many regex changes introduced in perl 5.10. I would start looking there. I have no time to investigate further right now. I would make a local copy of this .pm file and start adding print statements to debug it further.

This should be submitted as a bug report. (Update: looks like the author is aware of this issue). Here is a reduced code example which still reproduces the error: 

use warnings;
use strict;

use Text::SpellChecker;
my $checker = Text::SpellChecker->new( text => "Foor" );
my $word = $checker->next_word;

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In reply to Re: Text-SpellChecker error by toolic
in thread Text-SpellChecker error by sarvan

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