Hello Maintainers,
I'm trying to debug this. I added 
    my $key;
    my $value;
    foreach $key (keys %$response )
    {
        # $value = %$response ($key);
        $value = $response->{$key};
        print "Schlüssel: $key  Wert: $value\n";
    }
before the offending line and got the additional output:
Schlüssel: tracks  Wert: ARRAY(0x557516e32b38)
Schlüssel: title  Wert: Die Olchis im Bann des Magiers
Schlüssel: track-count  Wert: 10
Schlüssel: id  Wert: 15hnoNO43l2LUGvUkfXAwvWnOhQ-
Schlüssel: barcode  Wert: 9783837306460
Schlüssel: artist  Wert: Erhard Dietl read by Rainer Schmitt
Schlüssel: disambiguation  Wert: CD 2 / 2

The values are as expected, but there is no key "releease" (and
subsequently no ARRAY behind it).

Sorry, I guess that is all I can do to debug this myself, please tell
me what other information are helpful for you.

Greetings

         Helge
-- 
      Dr. Helge Kreutzmann                     deb...@helgefjell.de
           Dipl.-Phys.                   http://www.helgefjell.de/debian.php
        64bit GNU powered                     gpg signed mail preferred
           Help keep free software "libre": http://www.ffii.de/

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