Delete When Update Data in Dynamic Form Laravel

I have a dynamic form. I can update or create new data successfully, but when I try to delete a row, it shows an error "Undefined array key "spec_name"". How can I delete one or multiple rows when there's no data is updated/created and when there is updated/created data?

This is the form design

View

<form action="{{route('product-spec.delete',$spec->id)}}" method="POST">
@csrf
@method('DELETE')
<a href="" class="product-spec-remove text-color-danger float-end">Remove</a>
</form>


Controller

//update product specifications
foreach ($request->specifications as $key => $specs) {
// Update
if (isset($specs['id']) && $specs['id']) {
$data = ProductSpecification::where('id',$specs['id'])->first();
$data->product_id = $products->id;
$data->spec_name = $specs['spec_name']; //the error is in this line
$data->value = $specs['value'];
$data->updated_by = Auth::user()->id;
// Create
} else {
$data = new ProductSpecification();
$data->product_id = $products->id;
$data->spec_name = $specs['spec_name'];
$data->value = $specs['value'];
$data->created_by = Auth::user()->id;
}
$data->save();
}

public function deleteSpecification(string $id)
{
$specifications = ProductSpecification::findOrFail($id);

//delete specification
$specifications->forceDelete();
}

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