Eloquent - Trying to get property of non-object

I am using Laravel 5.5 and I am having the following query:

                $instru = Instruments::where('name', '=', $coinArr[$key])->first(); 
                $i = Revision::where('id', '=', $instru->revisions_id)->first();
                if ($i ===  NULL) { ...

In the setup case $instru = NULL hence the query on the Revision model does not work.

My problem is that I if I var_dump($i) I get the following error and do not run into the if-clause.

[2017-12-26 21:38:10] local.ERROR: Trying to get property of non-object  

Any suggestions how to deal with this case?

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