Error

PHP Noticeyii\base\ErrorException

Trying to access array offset on value of type null

$_GET = [
    'id' => '80',
];

$_SESSION = [
    '__flash' => [],
    'cart' => [
        null,
    ],
];

Warning: file_put_contents(/var/www/instayab_ir/frontend/runtime/debug/65f971b584fad.data): failed to open stream: Permission denied in /var/www/instayab_ir/vendor/yiisoft/yii2-debug/LogTarget.php on line 57

Warning: touch(): Utime failed: Permission denied in /var/www/instayab_ir/vendor/yiisoft/yii2-debug/LogTarget.php on line 75