Errorexception (E_ERROR) Trying to get Property of non-object

Question

I tried to turn the page using backup to solve the problem but I can’t. I go up the page and she keeps on making the same mistake, I don’t know how to fix it. If there is some easier way for the server to recognize file updates, for example, it might be easier to resolve. Because it would put the backup file of the page with problem again. If anyone can also help me by giving a direction where this problem may be coming from.

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29. Illuminate View Engines Compilerengine handleViewException .../-vendor/-Laravel/-framework/-src/-Illuminate/-View/-Engines/-Phpengine.php41
30. Illuminate View Engines Compilerengine handleViewException .../-vendor/-Laravel/-framework/-src/-Illuminate/-View/-Engines/-Phpengine.php41
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32. Illuminate Exception Handler handleError .../-app/-Storage/-views/-e4eb13e60cfc4ad016623c6d6306139d3
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36. Illuminate View View getContents .../-vendor/-Laravel/-framework/-src/-Illuminate/-View/-View.php109
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39. include .../-vendor/-Laravel/-framework/-src/-Illuminate/-View/-Engines/-Phpengine.php37
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41. Illuminate View Engines Compilerengine get .../-vendor/-Laravel/-framework/-src/-Illuminate/-View/-View.php140
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URL page error: http://posmg.posesa.com.br/cursos/3

 <?php
$type = ($course_type == 1) ? 'pre': 'ead';
$name = Str::slug(strtolower($course->name));
$name = trim(str_replace('advocacia','',$name),'-..-');
$event = $type.'_'.$name;
?>
@if($course_type == 2)
<div id="side-with-margin">
<div class="pre-inscricao">
	<a href="{{ route('site.registrations') }}" onclick="ga('send', 'event', 'botao', 'clique', '{{ $event }}');" >
		<img src="{{ Image::url('layout/inscricao-verde.png') }}" alt="" class="img-responsive-center" border="0" />
	</a>
</div>
@if( Route::getCurrentRoute()->getName() != 'site.how_it_works' )
<div class="space-30"></div>
<a href="{{ route('site.how_it_works') }}">
	<img src="{{ Image::url('layout/como-funcionam.png') }}" alt="" class="img-responsive-center" border="0" />
</a>
@endif
<div class="space-30"></div>
<a href="{{ route('site.poles') }}">
	<img src="{{ Image::url('layout/polos-ead.png') }}" alt="" class="img-responsive-center" border="0" />
</a>
<div class="space-30"></div>
<div class="carousel_right">
	@include('site.components.depoimentos',compact('testimonials'))
</div>
</div>
@else
<div class="pre-inscricao">
<a href="{{ route('site.registrations') }}" onclick="ga('send', 'event', 'botao', 'clique', '{{ $event }}');" >
	<img src="{{ Image::url('layout/inscricao-verde.png') }}" alt="" class="img-responsive-center" border="0" />
</a>
</div>
<div class="space-30"></div>
<div class="carousel_right">
@include('site.components.depoimentos',compact('testimonials'))
</div>
@endif