Laravel Eloquent mapping data with relationship

I have an eloquent query with a relation but I get ErrorException: Trying to get property ‘id’ of shop->id.

    $collection = Lead::with('shop');
    $collection = $collection->orderBy('data', 'DESC');
    $collection = $collection->get();
    
        $json = $collection->map(function ($contact) {
                    return [ 
                     'id' => $contact->id,
                     'name' => $contact->name,
                     'shop' => [
                        'id' => $contact->shop->id,
                        'name' => $contact->shop->name
                      ],
                ];
        });

 return response()->json(['contacts' => $json], 200);

Is there any way to use eloquent mapping with relation?

>Solution :

Use Laravel’s helper method:
optional()

The optional function accepts any argument and allows you to access
properties or call methods on that object. If the given object is
null, properties and methods will return null instead of causing an
error:

Instead of:

// ...
                        'id' => $contact->shop->id,
                        'name' => $contact->shop->name
// ...

Use this:

// ...
                        'id' => optional($contact->shop)->id, ✅
                        'name' => optional($contact->shop)->name ✅
// ...