Laravel error while sending a queue email - php

Question

I'm facing the following error in the failed_jobs database table:
ErrorException: Undefined property: stdClass::$subscription in
/home/sm/public_html/app/Mail/NewCustomer.php:45
This is pretty basic. It means the property $subscription does not exists, but...the problem is that I don't call $subscription anywhere in the class code.
In the controller I assign the values:
$to = ['email' => 'someemail#gmail.com', 'name' => 'Name test'];
$mail = new \stdClass;
$mail->to = $to;
$mail->subject = 'Subject test';
$mail->body = 'Body test';
\Mail::queue(new \App\Mail\NewCustomer($mail));
And the NewCustomer class contains:
namespace App\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
class NewCustomer extends Mailable
{
use Queueable, SerializesModels;
/**
* Holds the item content
*
* #var Array
*/
protected $item;
/**
* Create a new message instance.
*
* #param Array
*
* #return void
*/
public function __construct($item)
{
$this->item = $item;
}
/**
* Build the message.
*
* #return $this
*/
public function build()
{
$this->to($this->item->to['email'], $this->item->to['name'])
->subject($this->item->subject)
->view('mails/new_customer')
->with('item', $this->item);
return $this;
}
}
The view mails/new_customer also does not contain anything related with $subscription.
Is this some cache problem or something? I can't figure out where the variable $subscription comes from.
If instead of Queue I send the email immediately, it works great:
\Mail::send(new \App\Mail\NewCustomer($mail));

Answer 1

Solved.
It was indeed a cache problem. Run php artisan queue:restart in terminal or through laravel:
\Artisan::call('queue:restart');