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PHP Warningyii\base\ErrorException

Attempt to read property "id" on null

$_GET = [
    'category-slug' => 'szkolenie',
    'slug' => 'spotkanie-z-technologia-lenovo-dla-data-center',
];

$_SESSION = [
    '__flash' => [],
    'frontend_language' => 'pl-PL',
];