JQuery Select2 cannot enable after disable

I am using Select2 version 4.0.5.

My Code

php

<select class="form-control customer" disabled>
    <option value=""></option>
    @foreach($customer as $c)
        <option value="{{ $c->id }}">{{ $c->user->name }}</option>
    @endforeach
</select>

jquery

$(function() {
    $('.customer').select2({
        placeholder: "Choose Customer"
    });
    $('.customer').val(0).trigger('change.select2');
});

$('.action_add').on('click', function() {
    $('.customer').select2('enable', false);
});

$('.action_delete').on('click', function() {
    if(IsEmptyRow()) {
        alert('test');
        $('.customer').select2('enable', true);
    }
});

Explanation

Enable false is working to make the select2 disable. When I want to enable it back, using enable true cannot make it enable back. The alert test inside the if code block is working.

System Details

Mac OS 10.13.5 PHP 7.0.9 Laravel 5.5

[conangithub]

The $('.customer').select2().prop("disabled", true); still cannot enable it back.

[hariharan-baskaran]

Hello @kevin-brown , The dropdown gets disabled , but once the dropdown is disabled, on clicking of space or enter keys , the drop down opens and we can change the values . Is there any other way we could disable it ? Have been trying out all the options here and have also looked into stackoverflow .