Handle exception in laravel - development

Handle exception in laravel

I have written code for creating roles in laravel i am using spatie package when i try to create new role then it gives exception like
Spatie Permission Exceptions RoleDoesNotExist

I know its generating because role does not exists, i dont know how to handle exception in laravel.

also is there any way i can first check role exists or not and then add the role?
following is my code

public function create()
    {
         //print_r($_POST);
         $role_name=$_POST['name'];
         $create_product=NULL;
         $edit_product=NULL;
         $view_product=NULL;

          if(isset($_POST['create_products']))
         {
            $create_product=$_POST['create_products'];
         }
         if(isset($_POST['view_products']))
         {
            $view_product=$_POST['view_products'];
         }
          if(isset($_POST['edit_products']))
         {
            $edit_product=$_POST['edit_products'];
         }
         echo $create_product; echo $view_product; echo $edit_product;

         dd(Role::findByName($role_name));

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