laravel relations error Trying to get property of non-object

I'm trying to retrieve data from two tables and in order using a hasMany relationship. i.e

Public childModel (){

return $this->hasMany(childModel); }

In the view when I run the foreach loop:

foreach($parentModel as $parentModel)

or

foreach($parentModel->childModel as $childModel)

then

I get json printed on my screen just fine (including the column I want to output.)

When I try I get "Trying to get property of non-object"

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