in_array(): Argument #2 ($haystack) must be of type array, null given

there's 3 checkboxs when i create the record i may select or not, if i did't select it gives me this error also i'm doing if condition to be if not null so it shouldn't work but idk it gives this error

in_array(): Argument #2 ($haystack) must be of type array, null given

 @if ($permit->job_type != null)
<div class="col-md-5">
 <label for="job_type_1">السقالات</label>
<input type="checkbox"
@if (in_array(1, json_decode($permit->job_type))) disabled checked @else disabled @endif>
<label for="job_type_2">الكهرباء</label>
 <input type="checkbox"
 @if (in_array(2, json_decode($permit->job_type))) disabled checked @else disabled @endif>
 <label for="job_type_3">الونش \الرافعة</label>
<input type="checkbox"
 @if (in_array(3, json_decode($permit->job_type))) disabled checked @else disabled @endif>
 </div>
  @endif