Undefined index: path, when adding new custom service provider in laravel 5.8

I want to add new custom service provider to set session_lifetime. The value for it, I got it from database. For do this thing I create service provider. But after the service provider registered. I got and error like this : Undefined index: path.

This is my new service provider code :

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Config;
use Illuminate\Support\Facades\DB;

class ParameterSettingServiceProvider extends ServiceProvider
{
/**
 * Bootstrap services.
 *
 * @return void
 */
public function boot()
{

}

/**
 * Register services.
 *
 * @return void
 */
public function register()
{
    if (\Schema::hasTable('parameter_settings')) {
        $settings = DB::table('parameter_settings')->first();
        if ($settings) //checking if table is not empty
        {
            $config = array(
                'driver' => env('SESSION_DRIVER', 'file'),
                'lifetime' => env('SESSION_LIFETIME', $settings->session_expired),
                'expire_on_close' => true,
            );
            Config::set('session', $config);
        }
    }
  }
}

And this is my config/app.php to register the service provider :

    /*
     * Application Service Providers...
     */
    App\Providers\AppServiceProvider::class,
    App\Providers\AuthServiceProvider::class,
    // App\Providers\BroadcastServiceProvider::class,
    App\Providers\EventServiceProvider::class,
    App\Providers\RouteServiceProvider::class,
    App\Providers\ParameterSettingServiceProvider::class,

How to fix this error?

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