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PHP Noticeyii\base\ErrorException

Trying to get property 'artist_id' of non-object

$_GET = [
    'slug' => '%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF-%D8%A2%D9%84%D8%A8%D9%88%D9%85-%D9%87%D8%A7%DB%8C-billy-ocean',
];