Maybe check if $gz is an empty string and don't try to call gunzip() in that case?
I also can't reproduce your problem. eval catches the error message correctly for me with your code (amended below to show that):
use 5.012;
use warnings;
use Gzip::Faster;
my $gz="";
my $data;
eval {$data=gunzip($gz)};
if($@) {
say qq(error: $@)
};
say "Done"
This gives me the output:
Attempt to uncompress empty string at ...
Done
Most likely the code you post is not the code you run.
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