in reply to fasta file
You need to check that $accession{$g} exists before using it. Something like changing the line
if ($accession{$g} =~ m/$accession_id/i){
to
if (exists $accession{$g} && $accession{$g} =~ m/$accession_id/i){
should do the trick.
EDIT: BrowserUK posted an answer while I was composing mine. His is more comprehensive.
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