Isset check on Array - Blade Laravel 5.8

If I do

I got

array:7 [▼
  "created_at" => "2019-12-30 17:31:55.728307+00:00"
  "fail_cnt" => 123
  "updated_at" => "2019-12-30 17:31:55.728307+00:00"
]

Hints: It is an array, not an object.

I'm trying to use the isset check on an array

<input required type="number" name="slaac" class="form-control form-control-sm"  placeholder="1000" value="">

I kept getting

What did I do wrong ?

via Chebli Mohamed