laravel5.4 Trying to get property of non-object

下面的圖是打印$post結(jié)果

@extends("layout.main")

@section("content")

<div class="col-sm-8 blog-main">
    <div class="blog-post">
        <div style="display:inline-flex">
                <h2 class="blog-post-title">{{$post->title}}</h2>
              
                <a style="margin: auto"  href="/posts/{{$post->id}}/edit">
                    <span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
                </a>
                
               
                <a style="margin: auto"  href="/posts/{{$post->id}}/delete">
                    <span class="glyphicon glyphicon-remove" aria-hidden="true"></span>
                </a>
                
        </div>

        <p class="blog-post-meta">{{$post->created_at->toFormattedDateString()}} by <a href="#">{{$post->user->name}}</a></p>

        <p>{!! $post->content !!}</p>
        <div>
          

        </div>
    </div>

    <div class="panel panel-default">
        <!-- Default panel contents -->
        <div class="panel-heading">評論</div>

        <!-- List group -->
        <ul class="list-group">
            @foreach($post->comments as $comment)
            <li class="list-group-item">
                <h5>{{$comment->created_at}} by {{$comment->user->name}}</h5>
                <div>
                    {{$comment->content}}
                </div>
            </li>
            @endforeach
        </ul>
    </div>

    <div class="panel panel-default">
        <!-- Default panel contents -->
        <div class="panel-heading">發(fā)表評論</div>

        <!-- List group -->
        <ul class="list-group">
            <form action="/posts/comment" method="post">
                {{csrf_field()}}
                <input type="hidden" name="post_id" value="{{$post->id}}"/>
                <li class="list-group-item">
                    <textarea name="content" class="form-control" rows="10"></textarea>
                    <button class="btn btn-default" type="submit">提交</button>
                </li>
            </form>

        </ul>
    </div>

</div><!-- /.blog-main -->

@endsection