laravel - How to fix Stripe InvalidRequest Exception - Invalid array exception? (PHP)

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I'm trying to make Controller for checkouts on my eshop, Stripe returns InvalidRequestException. It worked when it was hardcoded, it doesn't now.

This is function in my controller:

public function checkoutSession(){
        \Stripe\Stripe::setApiKey('api_key');

        $YOUR_DOMAIN = 'http://example.com';

        $line_items = array();

        foreach(Cart::content() as $row){
          $product_data = ['name' => $row->name];
          $price_data = ['currency' => 'eur', 'unit_amount' => intval($row->price * 100), 'product_data' => $product_data];
          $line = ['price_data' => $price_data, 'quantity' => $row->qty];
          array_push($line_items, $line);
        }

        $checkout_session = \Stripe\Checkout\Session::create([
            'payment_method_types' => ['card'],
            'line_items' => $line_items,
            'mode' => 'payment',
            'success_url' => $YOUR_DOMAIN . '/success.html',
            'cancel_url' => $YOUR_DOMAIN . '/cancel.html',
          ]);

        return response()->json(['id' => $checkout_session->id]);
    }

This is the response:

Stripe\Exception\InvalidRequestException: Invalid array in file /Users/radoslavkuchar/iSell/vendor/stripe/stripe-php/lib/Exception/ApiErrorException.php on line 38

And this is $line_items array:

[{"price_data":{"currency":"eur","unit_amount":399,"product_data":{"name":"Test product"}},"quantity":2}]

Any help?