Trying to get property of non-object - Laravel 5

If you working with or loops (for, foreach, etc.) or relationships (one to many, many to many, etc.), this may mean that one of the queries is returning a null variable or a null relationship member.

For example: In a table, you may want to list users with their roles.

<table>
    <tr>
        <th>Name</th>
        <th>Role</th>
    </tr>
    @foreach ($users as $user)
    <tr>
        <td>{{ $user->name }}</td>
        <td>{{ $user->role->name }}</td>
    </tr>
    @endforeach
</table>

In the above case, you may receive this error if there is even one User who does not have a Role. You should replace {{ $user->role->name }} with {{ !empty($user->role) ? $user->role->name:'' }}, like this:

<table>
    <tr>
        <th>Name</th>
        <th>Role</th>
    </tr>
    @foreach ($users as $user)
    <tr>
        <td>{{ $user->name }}</td>
        <td>{{ !empty($user->role) ? $user->role->name:'' }}</td>
    </tr>
    @endforeach
</table>

Edit: You can use Laravel's the optional method to avoid errors (more information). For example:

<table>
    <tr>
        <th>Name</th>
        <th>Role</th>
    </tr>
    @foreach ($users as $user)
    <tr>
        <td>{{ $user->name }}</td>
        <td>{{ optional($user->role)->name }}</td>
    </tr>
    @endforeach
</table>

If you are using PHP 8, you can use the null safe operator:

<table>
    <tr>
        <th>Name</th>
        <th>Role</th>
    </tr>
    @foreach ($users as $user)
    <tr>
        <td>{{ $user?->name }}</td>
        <td>{{ $user?->role?->name }}</td>
    </tr>
    @endforeach
</table>

I got it working by using Jimmy Zoto's answer and adding a second parameter to my belongsTo. Here it is:

First, as suggested by Jimmy Zoto, my code in blade from

$article->poster->name 

to

$article->poster['name']

Next is to add a second parameter in my belongsTo, from

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

to

return $this->belongsTo('App\User', 'user_id');

in which user_id is my foreign key in the news table.

I implemented a hasOne relation in my parent class, defined both the foreign and local key, it returned an object but the columns of the child must be accessed as an array.
i.e. $parent->child['column']
Kind of confusing.

Is your query returning array or object? If you dump it out, you might find that it's an array and all you need is an array access ([]) instead of an object access (->).