Fatal Exception Handled Twice？

我在app\exceptions\handler里面的report方法里调用我自己的mailable实现报错后发送邮件的功能，但是莫名其妙的每次我测试，都会收到两封邮件，然后我注释掉了我的mailable后，继续测试，我这边查看日志，会出现一模一样的两个错，提了issue，说这事因为error_last_clear（）错误被handle了但是没有最后清理掉，这算是bug吗
代码：

 public function report(Exception $exception)
    {

           if ($this->shouldReport($exception)) {
               Mail::to('leslie@aliyun.com')->send(new ReportException($exception));
           }
        parent::report($exception);

    }

mailable代码：

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Exception;

/**
 * Class ReportException
 * @package App\Mail
 */
class ReportException extends Mailable
{
    use Queueable, SerializesModels;

    /**
     * Create a new message instance.
     * @return void
     */

    protected $exception;

    /**
     * ReportException constructor.
     * @param $exception
     */

    public function __construct(Exception $exception)
    {
        $this->exception = $exception;
    }

    /**
     * Build the message.
     * @return $this
     */

    public function build()
    {
        return $this->view('mail.error')->with([
            'Code' => $this->exception->getCode(),
            'Message' => $this->exception->getMessage(),
            'File' => $this->exception->getFile(),
            'Line' => $this->exception->getLine(),
            'Trace' => $this->exception->getTraceAsString()
        ]);
    }
}