Warnings in HTTP::Cookies

I have a program which generates the following warnings:

Use of uninitialized value in concatenation (.) or string at 
/usr/lib/perl5/vendor_perl/5.8.3/HTTP/Cookies.pm line 88.
Use of uninitialized value in pattern match (m//) at 
/usr/lib/perl5/vendor_perl/5.8.3/HTTP/Cookies.pm line 136.
Use of uninitialized value in concatenation (.) or string at 
/usr/lib/perl5/vendor_perl/5.8.3/HTTP/Cookies.pm line 142.

I have LWP 5.79 installed but Cookies.pm is the same in 5.800.  The
lines mentioned, in my installation, are:

    88                  LWP::Debug::debug(" - checking cookie $key=$val");
   136                  if ($val =~ /\W/ && $version) {
   142                  push(@cval, "$key=$val");

It's difficult to produce a self-contained test case since this
program spends its time hitting someone else's website.  I hope that
the above information will be enough to investigate the warnings, but
I can try to make a small test case if it's wanted.

-- 
Ed Avis <ed@xxxxxxxxxxx>