Trying to get property of non-object in Laravel 5.1 - php

Question

Firstly it works fine But I don't know how to come this error in this page but this problem can be solve when i changed the code in view {{$training->first()->sectionsCount}} but my specification has been incorrect.
My complete error is:-
ErrorException in Training.php line 51: Trying to get property of non-object (View:resources/views/Training/index.blade.php)
My code in model is:-
public function sectionsCountRelation()
{
return $this->hasOne('App\Schedule')->selectRaw('training_id, count(*) as count')->groupBy('training_id')->where('training_end_date','<',carbon::now());
}
public function getSectionsCountAttribute()
{
return $this->sectionsCountRelation->count;<!--This is line 51 -->
}
In controller is
public function index()
{
$training = Training::with('sectionsCountRelation')->get();
return view('Training.index',compact('training'));
}
In View:-
#foreach ($training as $training)
<tr>
<td>{{$i}}</td>
<td>{{ $training->category }}</td>
<td>{{ $training->topic }}</td>
<td>{{$training->sectionsCount}}</td>
<td>Update</td>
<td>Schedule</td>
<td>
{!! Form::open(['method' => 'DELETE', 'route'=>['training.destroy', $training->id]]) !!}
{!! Form::submit('Delete', ['class' => 'btn btn-danger']) !!}
<?php $i++;?>
{!! Form::close() !!}
</td>
</tr>
#endforeach

Answer 1

Looks like you have some Trainings that have no Schedule assigned. That means, $this->sectionsCountRelation returns null and you can't access ->count on it. Try checking for null:
public function getSectionsCountAttribute()
{
return $this->sectionsCountRelation === null ? 0 : $this->sectionsCountRelation->count;
}