Well, one way would be to always pass a valid link to be followed. The other would be, as is specified in the WWW::Mechanize docs, to set autocheck to 0. Although, this would silence all requests unless they're errors.

In reply to Re^3: WWW::Mechanize follow_link() crashes if no link is found by arkturuz
in thread WWW::Mechanize follow_link() crashes if no link is found by venkatesan_G02

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