Php 我得到了错误FatalThrowableError类型错误：传递给Illumb\Http\Request:：merge（）的参数1必须是数组的类型，给定null

我想用Google Authenticator做一个双因素认证的登记表。当我尝试注册一个新的用户帐户，扫描生成的二维码，然后按下“完全注册”按钮时，我刚刚得到一个错误

FatalThroTableError类型错误：参数1传递给 Illumb\Http\Request:：merge的类型必须为array，null 给予，召唤 C:\xampp\htdocs\repository\app\Http\Controllers\Auth\RegisterController.php 在线113

这是我的注册控制器

public function register(Request $request)
    {
        //first we will validate the incoming request
        $this->validator($request->all())->validate();
        // Initialise the 2FA class
        $google2fa = app('pragmarx.google2fa');
        // store registration data in an array
        $registration_data = $request->all();
        // Create new secret key to the registration data
        $registration_data["google2fa_secret"] = $google2fa->generateSecretKey();
        // store registration data to the user session for new request
        $request->session()->flash('registration_data', $registration_data);
        // Create the QR image. 
        $QR_Image = $google2fa->getQRCodeInline(
            config('app.name'),
            $registration_data['email'],
            $registration_data['username'],
            $registration_data['google2fa_secret']
        );
        // Send the QR barcode image to our view
        return view('google2fa.register', ['QR_Image' => $QR_Image, 'secret' => $registration_data['google2fa_secret']]);
    }
    public function completeRegistration(Request $request) 
    {
        // add the session data back to the request input
        $request->merge(session('registration_data')); <- I got error because of this line (in line 113)
        // Call the default laravel authentication
        <br>return $this->registration($request);
    }

这是路线地址

路由：：获取“/完成注册”，“身份验证”\RegisterController@completeRegistration';

我已经在上面的寄存器控制器中输入了方法completeRegistration

使用if条件检查注册数据是否为空

if (session('registration_data') != '' && session('registration_data') != null)
{
    $request->merge(session('registration_data'));
}

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你需要像这样使用

$request->merge(['registration_date'=>session('registration_data')]);

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错误很明显：会话'registration_data'为空，它必须是一个数组。顺便说一句，用1个参数调用array_merge函数是没有用的