At first sight, this looks like a bug in WWW::Mechanize. In such cases you should check the documentation if this is mentioned somewhere, and then look at the bug tracker if it's reported.

If not, upgrade to the newest version of WWW::Mechanize, and check if the bug is still present. If yes, report it.

How should I do error handling on this?

You can inspect the returned HTML for the 'username' field, and if not present, try again. Yes, it's a workaround, not a fix.

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: Can't call method "value" on an undefined value at X?? by moritz
in thread Can't call method "value" on an undefined value at X?? by perlpreben

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