Hi

I am having invoices and customers and users how can generete both

Customer Model:

public function invoices()
{
    return $this->hasMany(Invoice::class);
}

Invoice Model:

public function customer()
{
    return $this->belongsTo(Customer::class);
}

When I log in as the first user I can retreive the customer name with:

{{ $invoice->customer->name }}

but when I log in as the second I get:

Undefined property: Illuminate\Database\Eloquent\Collection::$customer

What is happenig here?

Btw I retrieve the invoices in the controller like so:

$invoices = Invoice::where('user_id',Auth::user()->id)->latest()->get();

any help would be greatly appreciated