-w activates warnings globally, which causes escapeHTML to warn when you pass undef to it.

Fixed: 

my $msg_html   = escapeHTML( $q->param( 'msg'   ) // 'No msg'   );
my $error_html = escapeHTML( $q->param( 'error' ) // 'No error' );

[download]

In reply to Re: Warnings using -w by ikegami
in thread Warnings using -w by Anonymous Monk

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