Note that the eval will catch all errors, not just this one. It might be prudent to look at the contents of $@ (see perlvar) to see if the error you caught is really the one you want to skip silently.

my $value;
eval {
    $value = $record1->getAttribute('value1');
};
if ( $@ ) {
    next FILE if ( $@ =~ /^duplicate attribute/ );
    die $@;
}
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