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Invalid Argumentyii\base\InvalidArgumentException

Relation names are case sensitive. app\modules\product\models\Product has a relation named "" instead of "".

$_GET = [
    'id' => 0,
];

$_SESSION = [
    '__flash' => [],
    'cart' => [
        'products' => [],
        'amount' => 0,
        'total' => 0,
    ],
];