Error seeding database

[bellwood]

 Create Roles for user, default is admin and user? [y|N] (yes/no) [yes]:
 >

 Enter roles in comma separate format. [Admin,User]:
 >
In Connection.php line 664:

  SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL constraint failed: roles.guard_name (SQL: insert into "roles" ("name", "updated_at", "created_at") values (Admin, 2017-12-04 13:12:50, 2017-12-04 13:12:50))


In Connection.php line 458:

  SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL constraint failed: roles.guard_name

Edit:

Laravel 5.5.22 PHP 7.0.15

Following the blog article

[diorz38]

just fill:

Enter roles in comma separate format. [Admin,User]:
 >Admin,User,Author

and press enter

[bellwood]

I think the issue is that [Admin,User] implies it will be the default if you just hit enter, perhaps catch null input or make those the defaults if just enter is given?

[ManojKiranA]

 Create Roles for user, default is admin and user? [y|N] (yes/no) [yes]:
 >

 Enter roles in comma separate format. [Admin,User]:
 >
In Connection.php line 664:

  SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL constraint failed: roles.guard_name (SQL: insert into "roles" ("name", "updated_at", "created_at") values (Admin, 2017-12-04 13:12:50, 2017-12-04 13:12:50))


In Connection.php line 458:

  SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL constraint failed: roles.guard_name

Edit:

Laravel 5.5.22 PHP 7.0.15

Following the blog article

While the issues is occured

Enter roles in comma separate format. [Admin,User]: Enter the list of roles used in your application such as Admin,User,Editor,Publisher

[SanthoshSiddegowda]

In App/Providers/AppServiceProvider.php

use below code

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\Schema;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Schema::defaultStringLength(191);
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}