Laravel form submit - select don't pass

[ilyadavydyuk]

Very simple select:

<form action="laravel-request" method="post">
<select name="qq[]" multiple class="selectpicker">
  <option value="1">1</option>
  <option value="2">2</option>
</select>
<button type="submit">Send</button>

If no selectpicker class - form submit select values successfully. If selectpicker is active - form send NULL

What am I doing wrong?
bootstrap-select last ver.
laravel 5.2

[caseyjhol]

Duplicate of #1342.