Laravel Object error

i'm trying to add users with specified roles into database , an error indicates "ErrorException in 748460238d8f66b0fe4acb25c19f24f04b548bd9.php line 25: Trying to get property of non-object (View: ..\views\admin\users\index.blade.php)". below are the UserModel , index.blade.php and the controller. What's wrong ? Great thanks

<?php

namespace App\Http\Controllers;

use App\Role;
use App\User;
use Illuminate\Http\Request;

use App\Http\Requests;
use App\Http\Requests\UsersRequest;

class AdminUsersController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        //

        $users=User::all();
        return view('admin.users.index',compact('users'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        //

        $roles = Role::lists('name','id')->all();
        return view('admin.users.create',compact('roles'));
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(UsersRequest $request)
    {
        //
         User::create($request->all());
        //return $request->all();


      return redirect('/admin/users');
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function show($id)
    {
        //
        return view('admin.users.show');
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function edit($id)
    {
        //
        return view('admin.users.edit');
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return \Illuminate\Http\Response
     */
    public function destroy($id)
    {
        //
    }
}

<?php

namespace App;

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token'
    ];

    public function role(){

        return $this->belongsTo('App\Role');
    }
}

@extends('layouts.admin')



@section('content')

<h1>Users</h1>

<table class="table">
    <thead>
      <tr>
            <th>Id</th>
            <th>Name</th>
            <th>Email</th>
              <th>Role</th>
              <th>Status</th>
              <th>Created</th>
              <th>Updated</th>
      </tr>
    </thead>
    <tbody>
    @if($users)
@foreach($users as $user)

      <tr>
        <td></td>
        <td></td>
        <td></td>
          <td></td>
          <td></td>
          <td></td>
          <td></td>
      </tr>
      @endforeach
@endif
    </tbody>
  </table>


@stop

Migrations schema:

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateRolesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('roles', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('roles');
    }
}

<?php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('role_id')->index()->unsigned()->nullabe();
            $table->integer('is_active')->default(0);
            $table->string('name');
            $table->string('email')->unique();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('users');
    }
}

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