cakephp 3 ORM find and foreach

I am playing with cakephp 3 to see how ORM is applied.

A very simple example where LessonsTable hasMany ImagesTable. I have created both Table classes so I have (in controller):

$lessons = TableRegistry::get('Lessons');
    $lessonsRows    = $lessons->find('all')->contain(['Images']);

then in the view:

foreach ($lessonsRows as $row) {
      echo $row->name."<br>";
     
      foreach($row->images as $image){
        echo "-->".$image->name. "<br>";
      }
    }

IIf a lessons doesn't have any image associated I get

Invalid argument supplied for foreach()

Do I have to check something before foreach?

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